Questions tagged [reproduction]

The biological process by which new individuals are formed.

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46 views

Why don't women ovulate more frequently?

As far as I understand, women release egg cells on a relatively consistent schedule, and there are times when no egg cells are present in the uterus/fallopian tubes. Why don't women release eggs more ...
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How did Whittaker use 'reproduction' as a criterion for five kingdom classification?

I can understand how the other criteria - complexity of cell, complexity of organism, mode of nutrition and phylogenetic relationship were used. But I didn't really understand how reproduction was ...
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Is the phrase “survival of the fittest” accurate? What are the other factors in the natural selection beside survive?

According to Wikipedia: While the phrase "survival of the fittest" is often used to mean "natural selection", it is avoided by modern biologists, because the phrase can be ...
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Motion of Fallopian tube fimbriae

The fimbriae at the ovary end of Fallopian tubes are described as "sweeping" eggs from ovaries into the tubes: When ovulation is about to occur, the sex hormones activate the fimbriae, ...
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How does a diploid sporophyte form in non-recurrent apomixis?

I came across this definition of non-recurrent apomixis which occurs in angiosperms- In non-recurrent apomixis, both the egg-cell and embryo are haploid and embryo is developed directly from an egg-...
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Why is Somatic Cell Nuclear Transfer (SCNT) less effective for interspecies?

Somatic Cell Nuclear Transfer (SCNT), a process for replacing the nucleus of an egg cell with a nucleus containing genetic information of a different animal, seems to be very useful for cloning and ...
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Why do OX5034 GM mosquitos require the presence of tetracycline to survive? What does the drug do in this case?

I'm confused. Debug Fresno; why are the released mosquitos said to be sterile? from 2017 addresses male mosquitos released with a bacteria that will affect fertility of females after mating. They are ...
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Is there “stem” organelles in plant meristems?

Two cytoplasmic genomes exist in plant in addition to the nuclear one. As far as I understand, they divide more or less during the entire life of the plant along with cell proliferation/growth in ...
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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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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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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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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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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
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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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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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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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143 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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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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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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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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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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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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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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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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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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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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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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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
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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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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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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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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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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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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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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
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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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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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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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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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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
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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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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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