Questions tagged [reproduction]

The biological process by which new individuals are formed.

Filter by
Sorted by
Tagged with
-3
votes
1answer
37 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 ...
-4
votes
0answers
26 views

Why do we want to reproduce? [closed]

Presumably, we reproduce in order for our genetic information to survive. Why do we want our information to continue? Why do species want to survive? What is the ultimate motivation for reproduction?
0
votes
1answer
34 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-...
-1
votes
1answer
42 views

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
-1
votes
1answer
27 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
1
vote
0answers
24 views

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. ...
0
votes
1answer
21 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 ...
3
votes
1answer
993 views

Are there records of monozygotic twins in which one experiences androgen insensitivity syndrome

I have given my high school biology students the thought experiment of "What would happen if a researcher induced twinning of a female zygote and then replaced one of the X Chromosomes with a copy of ...
-2
votes
1answer
73 views

What is the difference between fragmentation and true regeneration?

I read in National Council for Education and Training study guide (NCERT) that Planaria (flat worms) undergo true regeneration. Fungi, filamentous algae and protonema of mosses multiply by ...
4
votes
1answer
63 views

Can sperm cells penetrate the cell membrane of non-ovum cells?

Sperm cells have tiny bags of enzymes on their tip (the acrosome) which allow them to penetrate the ovum. My question is whether or not the process that allows sperm cells to penetrate the cell ...
3
votes
1answer
54 views

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 ...
4
votes
1answer
57 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 ...
0
votes
1answer
27 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 ...
45
votes
1answer
7k views

Why do human females have periods?

Why do human women have periods when most animals don't? It is known that the unfertilized egg needs to be shed from the uterus. But why shed the whole endometrium? Why didn't evolution put ...
1
vote
2answers
773 views

Has autogamy been observed in any animals?

By my understanding, reproduction that is sexual, but with both gametes contributed by the same individual, is not at all uncommon in the plant kingdom. But where, if anywhere, does it occur in the ...
7
votes
1answer
13k views

How does a fetus retain a blood group different from its mother?

It's a well-established fact that blood group is decided by genotype. But, when a new child starts its journey in the womb, the mother's blood (along with it's agglutinins and agglutinogens) flows ...
2
votes
1answer
35 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 ...
0
votes
1answer
35 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 ...
1
vote
2answers
859 views

Fertilization of an egg by two sperm

What happens when two sperm fertilize an egg? This can be either naturally or by experiment.
2
votes
3answers
953 views

Many spermatozoa, but just one ovulum

Why do men produce so much spermatozoa, that will get discarded, but women, just one ovulum, which is a good one. Couldn't men produce good spermatozoa as a limited edition? Where is the evolutionary ...
-1
votes
1answer
35 views

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 ...
1
vote
1answer
60 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 ...
0
votes
2answers
100 views

What is the chance a given gene will end up in a given gamete?

Let us say a germ cell had a desired allele. This germ cell was replicated during interphase so that it had two of the desired allele. It then underwent meiosis. My question then is, what is the ...
3
votes
1answer
864 views

Are the seeds in a single capsicum fruit genetically identical?

Hopefully not a too-basic question for the venue. I'm a chile pepper growing hobbyist and have spent some time searching around and reading up on pepper (angiosperm) reproduction, but I'm not getting ...
0
votes
0answers
45 views

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 ...
10
votes
2answers
5k views

How is centriole number maintained during meiosis?

I've found a website (Pearson's BioCoach) that claims centrioles duplicate in Prophase II. Is this accurate? Does it depend on the species in question? Looking at three textbook illustrations of ...
2
votes
2answers
61 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 ...
1
vote
1answer
34 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?
9
votes
2answers
325 views

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 ...
0
votes
0answers
31 views

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 ...
0
votes
1answer
54 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 ...
3
votes
0answers
32 views

Looking for realistic representation of angiosperm sperm cells during pollination

I've scoured Youtube, google, and a handful of my botany textbooks for a cellular-scale photo, animation, or video illustrating an angiosperm sperm cell during pollination/fertilization. ...
2
votes
0answers
29 views

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 ...
0
votes
0answers
13 views

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 ...
2
votes
1answer
269 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 ...
1
vote
0answers
21 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 ...
0
votes
0answers
30 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 ...
5
votes
2answers
453 views

Why can't complex multicellular organisms reproduce by regeneration? [closed]

My textbook says that regeneration isn't possible in complex multicellular organisms. But why? Why can't specialized cells be present in the bodies of complex multi cellular organisms which can ...
0
votes
1answer
56 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?
0
votes
3answers
87 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 ...
0
votes
0answers
15 views

How did the tunicates evolve ability to reproduce by budding?

It seems that last common ancestor of chordates and last common ancestor of bilaterians could not reproduce by budding. If so, how it comes that tunicates developed budding? Are there other ...
32
votes
6answers
18k views

Why are not all species hermaphrodites?

If a hermaphrodite animal (like slug, snail, etc) finds a partner they can mate immediately. If another animal with "normal" reproduction (lets say a mouse) finds a partner they can only mate if they ...
1
vote
2answers
35 views

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 ...
0
votes
1answer
24 views

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 ...
1
vote
0answers
43 views

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 ...
2
votes
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 ...
2
votes
0answers
83 views

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 ...
0
votes
0answers
18 views

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 ...
0
votes
0answers
30 views

Do spiders lay their eggs on the same schedule, whether they have mated or not?

I have heard of many instances of unmated spiders laying egg sacs which are, of course, incapable of developing. Apart from a very few exceptions, female spiders release stored sperm from the ...

1
2 3 4 5
9