Questions tagged [reproduction]

The biological process by which new individuals are formed.

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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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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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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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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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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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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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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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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 ...
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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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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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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 ...
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Why do eels go through dams?

I was interested in eels after learning about dams. I learned that there are such things as eel ladders as there are salmon ladders for the animals to swim up the damns to continue their journey, but ...
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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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Plant hybridization - cross clade cross pollination possibility

Is it possible for monocots, like dates, to cross-pollinate with eudicots, such as olives? What is the general rule for how closely related species must be to form hybrids organically?
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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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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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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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Do large fathers engender a higher probability of caesarian section?

If a large father has a child with a smaller woman, i.e. 90kg and 45kg, are there higher chances that the baby will be too big to slip through the birth canal, resulting in a C-section?
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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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Is mating between human and non-human primates theoretically possible?

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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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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Sexual Reproduction in Humans

Is the human egg cell (ova) considered motile? We know that is is not actively motile but it is transferred via the fallopian tube to the uterus. Does that make it motile?
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Why don't most life forms show uniqueness in progeny? [duplicate]

I guess everyone must have observed this. Dogs, cats, and most of all insects (including mosquitoes) appear more or less the same. Why is there so little variation in their offspring, unlike humans, ...
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How can space travel affect women’s fertility?

From Time: The reasoning behind the prerequisite, according to officials, is that spaceflight could potentially harm the women's fertility. How can space travel affect a woman’s fertility?
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Why are dolphins born tail first?

I heard most dolphins are born tail first. I have read many explanations from books and internet articles and they said that dolphins are born tail first to prevent them from drowning. But now I don'...
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Is there natural occurrence of induced pluripotency / expression of Yamanaka factors and what is the evolutionary explanation of that?

Is there natural biological processes in which the full (full reprogramming into pluripotent state) or partial (partial reprogramming, stopped before point-of-no-return, preserving the functional ...
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How do animals learns seductional behaviour?

I was curious how the gender behaviour, the male role or female role, is known in mammals. Do mammals instinctively know how to do seduce the opposed sex or do the animals learn it from their parents/...
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Is newly produced sperm healthy if there was previous DNA damage?

I read that sperm cannot repair DNA damage. So does this mean that if your sperm has DNA damage, then all of your sperm (whether present or future) has DNA damage? Or does it just mean that the ...
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Animal reproduction when resources are scarce

(This question is aimed at animals that take care of their young, e.g. dolphins.) As I understand it, most animals reproduce if possible. The only way they don't is because they run out of resources. ...
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Mother's physiological response to baby crying

I have read several articles [1,2] that talks about the physiological response in mothers when their babies cry. Is there any studies performed and published that show that this is not true ? https:/...
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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 ...
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Has an ectopic pregnancy's blastocyst ever been made to implant?

Has an ectopic pregnancy's blastocyst ever been successfully extracted from the Fallopian tube and made to implant in the uterus?
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How can inbreeding be used for selecting mutations?

I understand that inbreeding, after a number of generations of crossing genetically related individuals eventually yields homozygotes, however I can't seem to understand how it can be used for ...
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What are the advantages of sexual reproduction over asexual reproduction? [closed]

What are the advantages of sexual reproduction over asexual reproduction? How does variation influence ecological and evolutionary success?
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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 ...

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