Questions tagged [reproduction]

The biological process by which new individuals are formed.

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Terms related to megasporogenesis

Well, I am not able to understand the exact difference between megasporocyte and archesporium. Also I'm not quite able to get, how or precisely from where do these arise? Please help.
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Why do some animals and fungi prefer asexual reproduction?

Animals like Sponges and Hydra and fungi like Yeast and Mushroom can reproduce both asexually and sexually. However, they only reproduce sexually if the 'circumstances' are 'bad'. Is there a specific ...
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How can drone bees be born from unfertilized eggs?

I am learning about Drone bees and I keep reading that they are born from unfertilized eggs. Now here is my question: if eggs are gametes and therefore reproductive cells, how can they turn into a new ...
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Why does the Corpus Luteum produce more Progesterone than Estrogen?

In the human ovarian cycle, follicular cells produce only Estrogen in high concentrations (to my knowledge). Yet after ovulation and formation of CL, which should be the remnant follicular cell mass, ...
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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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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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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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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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Volvox Cellular Reintegration

A couple of days ago, I answered this question over on worldbuilding.SE with some information about volvoxes, and commenter Liam Proven pointed out that one of the claims I made was dubious. I had ...
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What do chimpz/bonobos/orangutangs/gorillas feed their babies with?

I just read this question and it made me curious about what a more original baby diet would look like. So, at what age do our closest relatives in the animal kingdom start giving their offspring more ...
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Are cloned spieces significantly more vulnereble to deseases than sexually reproducing species?

I would like to be able to compare the risk for species to go extinct implied by their reproduction mechanism in the very short term. Imagine we choose some species A that can reproduce both sexually ...
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Correlation between menstrual period and lunar revolution

Is it just a coincidence that the the length of the entire menstrual cycle from one flow to the other lasts almost exactly as one lunar month?
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Does global sperm count decline also mean lower testosterone?

So I read about the sperm count decline in men in rich countries. I wonder if this is accompanied by other changes for example in testosterone levels or in other hormones linked with the reproductive ...
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Do marsupials ever die in childbirth?

Question: Do marsupials ever die in childbirth? Obviously the notion of there being a linear ordering of "least advanced" to "most advanced" life forms isn't correct. Still, often marsupials are ...
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How did genome replication first synchronise with cell division?

It is obvious that cell division in living organisms is now synchronised almost perfectly with DNA replication and, furthermore, the line of division has to intersect exactly the space between the two ...
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why hens determine the sex of the chick?

So, I have an exercise where I have to correct the second part of the sentence. It goes like this: In hens, the sex of the chicken is determined by hen, because the hen is the heterogametic ...
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Can telegony happen in humans like in Telostylinus angusticollis?

Is it possible for a human male to transmit features of his phenotype via non-genetic semen-borne factors to his mate's subsequent offspring sired by another male? As it happens in flies (Crean et al.,...
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Can crocodilians differentiate their offsprings from other young crocodiles?

I read that some species of crocodilians can take care of their young for as long as a year. How do parents differentiate their offsprings from other young crocodiles? Smell, appearance, sound?
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Why Interracial couples always give birth to colored one? [closed]

Whether couple is White male and colored female or White Female and colored Male but they always give birth to colored one. Why Interracial couples always give birth to colored one?
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Why does the ova remain viable for only a day after ovulation?

The ova remains viable for approximately 24 hrs after ovulation to be fertilised by a sperm. ...chances of becoming pregnant increase dramatically if you have sex during the 5 days before ovulation ...
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Role of neuraminidase in preventing polyspermy in humans

Neuraminidase is a hydrolytic enzyme present in the acrosome of human sperm. It removes neuraminic acid (salic acid) from glycoproteins. I have read in a book that due to this reason it (the enzyme) ...
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Why is sex pleasure giving activity but not childbirth?

Asking from an evolutionary viewpoint. Sex is a pleasure giving activity so that it encourages reproduction and spreading of genes. But childbirth ,the most crucial part of the reproductive process, ...
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Breeding Southern Right Whales Genetics

I don't know much about biology. I just like watching David Attenborough videos and this made me curious. I just watched this video about breeding Southern Right Whales, and these two quotes puzzled ...
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Difference between Fragmentation and Budding [closed]

I have heard about two terms stating similar things - Fission and Fragmentation . I know Amoeba undergoes fission and Fragmentation is done by spirogyra. So what's the main difference between them?
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Why does it take many sperm for one sperm to fertilize an egg?

Hundreds of acrosomes must undergo exocytosis to digest holes in the zona pellucida. This is one case that does not bear out the adage, “The early bird catches the worm.” A sperm that comes along ...
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How many mitotic divisions do haploid cells undergo before fertilization?

Background This question is about human physiology and gametogenesis. A spermatozoid is not necessarily the direct "offspring" of a diploid cell. Stated differently, a spermatozoid cell can be the ...
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Ancestral states of sex determination system

Most (maybe all?) species that reproduce sexually have either genders (anisogamy) or mating types (isogamy). There exist today many different type of sexual determination system. There is a whole ...
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Difference between inbreeding and interbreeding

Is inbreeding the same as interbreeding? On this site interbreeding is defined as (http://www.thefreedictionary.com/interbreeding): To breed with another kind or species; hybridize. To breed ...
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recombinant gametes

Suppose you are able to observe under a microscope the total number of meiotic divisions occurring in one gonad of a given individual and to outnumber exactly the crossovers between two given loci ...
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Why does the ovum prefers to be arrested at metaphase 2 of meosis before fertilization? What is the possible advantage of this process?

Why does the human ovum prefers to be arrested at metaphase 2 of meosis before fertilization? What is the possible advantage of this process??Please help me with it.
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How does sperm gets oxygen in the female reproductive tract?

At the time of insemination, sperm along with seminal plasma enters in female reproductive tract and the plasma contains fructose for providing the energy to sperm If the fructose follows just EMP ...
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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 ...
Null Gene's user avatar
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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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Is being able to interbreed and produce fertile offspring a transitive relation in biology?

Being able to interbreed and produce fertile offspring is one criterion to decide whether two populations are of different species. Are there 3 populations A, B, C such that A and B are able to ...
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Is it Theoretically Possible to Create a Male clone from the donor Cell of a Female?

I understand that Dolly the Sheep was created without the presence of a sperm cell. Instead, nucleus DNA from somatic cells of adult sheep were used. Since Dolly was female, i am assuming that the ...
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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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Can any organism possibly have the capability to create a new species every time it reproduces?

There are lots of different kinds of living organism in our planet. So i was wondering if such an organism could possibly exist? Can any organism possibly exist, that would have the capability to ...
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Do chickens always lay eggs?

http://de.wikipedia.org/wiki/Hühnerei says it takes up to 24 h for a chicken to produce an egg. Is that dependent on the chickens nutrition, i.e., if it does not get enough food or the wrong kind, ...
DisplayName's user avatar
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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?
Stanley Scott's user avatar
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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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can self-fertilization in flowers be called asexual reproduction?

Suppose a flower having both male and female reproductive parts is self-fertilized then can this be called asexual reproduction...?I'm quite confused cause in this case the fusion of male and female ...
Suzie Waters's user avatar
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3 answers
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Are missing limbs hereditary?

So with my basic understanding of biology, DNA can change over time. Does this mean that if one (or both) parents have something major missing (like a limb), the kid will come out without a limb? ...
CodyJHeiser's user avatar
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1 answer
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What is the name of this type of inflorescence?

I was having a look at a rhizophora plant (from the mangrove family), and I got curious about its inflorescence. I can't make out what kind of inflorescence it is. Here is a photo of the ...
agha rehan abbas's user avatar
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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-...
user62354's user avatar
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How can seedless fruits not be GMO?

Biology is the closest I could find to botany on SE. Grafting can not occur naturally and so if a fruit does not have seeds there is no way it could reproduce in nature. That logic makes complete ...
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Spermatogenesis question

I found this diagram in my textbook regarding the process of spermatogenesis. But, I doubt if the labelling done is correct or not. Especially, I can't figure out any difference between the cells ...
DJ Koustav's user avatar
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Is there any possibility that gender is determined by Temperature? [duplicate]

One day I was watching TV show. It was based on Fire Dragon. They stated that if the dragon provide greater warmth to the egg, then a male Dragon will hatch. And if the Dragon provide less warmth to ...
Creepy Creature's user avatar
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How do you consider an organism to be a new species? [duplicate]

How do you consider an organism to be a new species? Can a new parthenogenetic organism be considered as a new species?
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Do pyrosomes reproduce by ways other than cloning?

I know that Pyrosomes are large colonies of floating tube-like animals that live in the sea, particularly in the tropics. They are just like any type of free floaters I know that pyrosomes can ...
Stavious's user avatar
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What is the difference between embryology and developmental biology?

The question is quite explanatory in it self, I used to think that both are same but then find somewhere that embryology is a part of developmental biology, can somebody please elucidate?
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