Questions tagged [reproduction]

The biological process by which new individuals are formed.

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1answer
68 views

How do honeybees requeen themselves?

It is said that beehives once queenless try to rear a new one by themselves. Beekeeping resources, books, websites, youtube videos, etc. have a very pragmatic human-centered view to the issue: what ...
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2answers
48 views

Why isn't the ovum reabsorbed into the body (like sperms) if it is not fertilised?

I have read that when sperms are not ejaculated out of the body, they are broken down and reabsorbed. Why can't the ovum be reabsorbed into the body instead of shedding it out during menstruation.
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Can half a lentil sprout?

This is a follow up to this question of mine. Let's take the example of non-dehusked lentils. One lentil generates one sprout. What if I split the lentil in its two parts? (Notice that I don't know ...
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28 views

Do some animals have a tolerance to the negative effects of inbreeding?

Are some animals more or less tolerant to inbreeding? By tolerant I mean do they have a genetic mechanism that allows them to inbreed and corrects for issues introduced through this? When I started ...
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1answer
59 views

Is human zygote unicellular or multicellular [closed]

Is the human zygote which is formed by fusion of sperm and egg a unicellular structure? Bcz at some places the 2 celled stage which is formed due to cleavage has been labelled as the zygote. So is the ...
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32 views

Which eukaryotic species had evolved the most after losing ability of sexual reproduction?

It seems sexual reproduction is ubiquitous in eukaryotes, so it is important despite needing excessive resources spent. It is an evolutionary adaptation for better evolution. Still, there are species ...
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1answer
60 views

Are there any species whose descendants can meet their ancestors from 100 generations back?

I.e. Humans can sometimes meet even their great-great-grandparents, but are there any species that can be alive at the same time as their great-great-……-great-grandparents? I imagine it would be those ...
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51 views

Check simple human fetus answers

Based on this image and questions, could someone please check my answers? Question 1: At which one of the following points will the blood passing the point be more oxygenated after birth than before ...
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Does lack of adaptations for sperm competition necessarily shows the species are monogamous/serially monogamous/polygynous?

On the one hand adaptations for sperm competition, such as large testes, mate guarding, etc. are used to support that female in species are promiscuous. On the other hand we know multiple eusocial ...
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1answer
40 views

Multiple fission and spore formation

I came across this question today. In the B diagram, zoospores of chlamydomonas is given. Now my doubt is, are the zoospores formed by multiple fission or spore formation? If it is by spore formation, ...
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1answer
142 views

A study has found that cell phones cause infertility, is this something to worry about or is the study flawed?

Is this a worrying study, or is it flawed? A study has found that cell phones are detrimental to male sperm quality (Lower sperm motility and sperm concentration). It’s original goal was to determine ...
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1answer
51 views

Reproduction in animals

Humans have acquired knowledge about their environment through many observations. Today, humans have wide variety of resources to gain knowledge about reproduction in human beings and other ...
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1answer
61 views

How does permanently modifying human DNA work? And how does it impact procreation?

So I read an article about a metabolic disease being treated with gene therapy, where they inserted corrective dna into the patient. https://www.independent.co.uk/news/science/dna-permanent-change-...
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1answer
31 views

How do plants that reproduce with artificial vegetative propagation grow in nature?

How do plants that grow with artificial vegetative propagation grow in nature? Will they go extinct if humans stop intervening? e.g., Rose
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Flatworms sexual reproduction; one must be the mother and the other the father?

I watched this. I wonder if both of these flatworms ever end up pregnant. Earthworms are simultaneous hermaphrodites, meaning worms have both male and female reproductive organs, just like flatworms. ...
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1answer
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How the vaccine based on “non replicating viral vector” is produced?

As I understand, this kind of vaccine is a virus that can infect the cell, start synthesis of proteins encoded by its genome, but cannot finish the replication cycle till the proper end. It can have ...
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1answer
104 views

Germ cells vs. gametes

Naively, I thought that germ cells are diploid (in diploid species like human/mouse at least). Then, germ cells undergo meiosis and become haploid. I thought this was the critical change that defined ...
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1answer
28 views

Why are so many species reproducing late this year?

Hope this question is OK for this site, couldn't see where else to ask it. We've spent a few days out in the countryside recently, and have been very surprised at how many species appear to have very ...
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1answer
114 views

What is the difference between fragmentation and true regeneration?

I read in my book that Planaria (flat worms) undergo true regeneration. Fungi, filamentous algae and protonema of mosses multiply by fragmentation. What is the exact difference between fragmentation ...
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1answer
55 views

Asexual Reproduction Of sponges through endogenous or exogenous budding?

I was studying asexual reproduction in sponges and came across two website Wikipedia of Gemmule and there is a line.... Only Endogenous Types of Buds develop into New Sponges. Then as I was reading ...
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1answer
39 views

Monozygotic vs Dizygotic heteropaternal superfecundation

Update: I had a wrong assumption. After triple checking, I now see that how ordinary monozygotic twins arise is 1 sperm and 1 ovum and then later the zygote splits up. (1.1. and that that phil and ...
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1answer
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Is there alternation of generations in animals other than cnidarians?

Are there other animals besides cnidarians that exhibit alternation of generations (having distinct sexual and asexual life stages)? If so, what are these animals? Further, why do so few animals have ...
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What is this moth doing on the ceiling (or wall), and could that be used as a suppression vector to infestation

This question is about the behavior (not identification) of very likely this species, and -- to be more curious and cover more bases if applicable -- about any similar behavior in the same family or ...
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1answer
66 views

What large “package” is carried by this large spider underneath itself?

One night in early May in northern Taiwan a strange looking spider carrying a large white "package" underneath itself ran in front of me and stopped, so I photographed it. The package is roughly the ...
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2answers
64 views

What do the initial cell divisions look like in bird embryogenesis?

The germ disc in a bird (a disc because its a chordate) is a mystery to me. The ovum (yolk) is a huge mass of nutrients. It then gets impregnated. Then, what? What does the initial cell divisions look ...
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1answer
39 views

In what “space” does egg mature in Kiwi?

This huge egg here, is it sort of tethered to the ovary, filling up the coelomic cavity, and then exiting out of the infundibulum, or, where is it in the bird exactly? What "space" does it occupy?
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What is the relation between “classes” (stem cell, proliferative and differentiating) and the types (Ad, Ap, B) of the spermatogonium?

Describing the question in the title further, The section, Systems Toxicologic Pathology, Dianne M. Creasy, Robert E. Chapin, in Haschek and Rousseaux's Handbook of Toxicologic Pathology (Third ...
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Is self-fertilization in hermaphrodite animals an asexual or sexual reproduction?

There are various Hermaphrodite animals, which can self fertilize. So can this be called sexual reproduction because there is fusion of gametes though from the same individual ? Or asexual because ...
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1answer
67 views

Is “Cloning” exact or almost similar to parent?

I was studying "Reproduction in Organism" as an interest of my own and there was a line offspring produced through single parent are exact copies of their parent. Also, they are genetically ...
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1answer
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How do fish transport egg to, and out of, coelom?

How do gametes get into coelom, and, later out of it? Excretion can be under quite heavy pressure, see https://www.youtube.com/watch?v=1OsRbuEINXI
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Tips on sexing of a pet Green Anole? (Besides length)

So I'm looking into lizard breeding (Mainly Leopard Geckos and Anoles) I catch wild ones and also buy them around, but some of them are very close in size and length. I have some males that I know ...
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1answer
727 views

Difference between sexual and asexual spore

This Wikipedia article on Spores mentions this: In biology, a spore is a unit of sexual or asexual reproduction that may be adapted for .... What is the difference between the sexual spore and ...
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23 views

How does DNA shape a living organism? [closed]

I'm haven't studied biology so excuse me if I'm getting something wrong. I'm trying to understand how the DNA from a sperm and egg cause the egg too multiply and form a perticular shape (shape of a ...
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32 views

Is there any known pharmaceutical or chemical that could cause infertility in humans in a single dose with few or no other effects?

Is there any known pharmaceutical or chemical that could cause infertility in humans in a single dose with few or no other effects? The context is that a number of claims are circulating about ...
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1answer
25 views

Will moth larvae pupate in response to food deprivation

Context: Trying to exterminate a clothes moth infestation. Supposing you have a room with clothes moths, or rather, with clothes moth eggs and larvae. Suppose then, that you remove all of the soft ...
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3answers
112 views

Why does inbreeding cause genetic defects, but cell division in one's own body does not?

I was watching a DNA transcription video when I realized that cells basically create copies of DNA all the time in our body. There may be a few mutations/errors, but it works out fine. However, when ...
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1answer
96 views

Where does Embryo Implantation occur? [closed]

Where does the embryo get implanted? If it is in the uterus side wall, why is the embryo shown hanging from top in some pictures?
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2answers
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When does LH surge actually occur?

I’ve seen many textbooks saying that LH surge occurs in the Follicular phase while others say it occurs in the Ovulatory phase. I’ve tried googling this, only to end up knowing two things: 1) It ...
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1answer
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How can I make legal mature female Cannabis plants to Flower in home during March (springtime)? [closed]

In December 2019 I purchased 4 Cannabis seeds Legally in Canada.Two of my plants are now about 100 cm tall. I am using wide-spectrum LED grow lights and have fertilized them both. I started with 16 ...
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Can a Chihuahua and a Great Dane breed the “old fashioned way?”

I saw this vid: https://youtu.be/eu2qe-FNtjg And this question crossed my mind. The dog in the video seems to be boxer sized... And I wonder if that strategy would work with something a little ...
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1answer
100 views

Can I execute/model a genome? [closed]

Hi I am wondering if we can execute a genome on the sub-cellular level by running it on the computer. What I mean is using the genome as data to examine by having the cells reproduce and see what ...
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Sperm formation - Frequent Ejaculations

I have visited various authenticated websites and other materials and learnt that a complete sperm development takes approximately 64 days. My doubts : If sperm truly takes 64 days to develop, how ...
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What is Balbiani's vitelline body function?

I tried searching on Google Scholar but I found little to no information about this Balbiani's vitelline body. I don't even know why it is called vitelline...I've been taught that it can be seen ...
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What causes the shape of the dense structure in this “giant squid egg” sac?

The YouTube video Swimming Next To Giant Squid Egg shows a giant egg of a squid and/or an egg of a giant squid. Text in the video's description includes the text quoted below, which indicates that the ...
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1answer
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What is meant by Physarum polycephalum having 720 sexes?

There is currently some media hype about the slime mold Physarum polycephalum, which will soon be exhibited in the Paris zoo. This was my first time hearing about slime molds, but so far so good. ...
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1answer
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What's it called when a male seahorse gets “inseminated”?

I am looking for the scientific term for the process where a male seahorse receives eggs from the female. For example, we usually say, "the male inseminates the female with sperm." What is the correct ...
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1answer
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Can foraging worker ants become queens?

The TL;DR is in the subject line. The back story is as follows: I am combating ants in my high-rise apartment unit. One piece of online advice was to vacuum regularly, and pay attention to edges of ...
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2answers
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Is there an example of a species wherein the female lays eggs in the male?

There are of course many species which lay eggs in the bodies of another species and also many species where either the male is eaten after mating or the male dies soon thereafter. So it seems ...
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0answers
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Is mating between human and non-human primates theoretically possible? [duplicate]

I wonder if it is theoretically achievable to produce living offspring between a human and a non-human primate. Great apes have 24 pairs of chromosomes compared to our 23, however, it is known that a ...
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1answer
469 views

Difference between fertilin and fertilizin

I am confused between fertilin and fertilizin.Are these two same or different? Here are a few sources i referred Julian Lombardi (auth.) - Comparative Vertebrate Reproduction-Springer US (1998) Page ...

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