Questions tagged [reproduction]

The biological process by which new individuals are formed.

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1answer
85 views

Can I execute/model a genome?

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 and human sexual reproduction [closed]

This is not a personal question. I understand that there are two ways to view this question. I have asked in the interest of understanding the male reproductive system. I'm not asking for any personal ...
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1answer
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Sperm formation - Frequent Ejaculations

This is not a personal medical question and this is not my case situation. I just want to understand the science and the reasons behind my questions asked below. Please help me understand the science ...
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Cone-Bearing Plants Reproduction [closed]

How do plants with cones reproduce? Do they have pollen, seeds, or spores? I found cone-bearing plants reproduce sexually, but 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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30 views

Why do humans start menstruating so early?

Wikipedia's article on teenage pregnancy says: Pregnancy can occur with sexual intercourse after the start of ovulation, which can be before the first menstrual period (menarche) but usually occurs ...
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23 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 ...
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19 views

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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1answer
808 views

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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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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1answer
144 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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1answer
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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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1answer
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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 do hydrophytes lack endothecium

So I read that endothecium is a layer in the anther wall and it usually contains layers of alpha cellulosic fibrous bands that help in the dehiscence of anther Further hydrophytes lack this layer So ...
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Does the Chorion Completely enclose the Amnion in Humans

When a human baby is born "en caul" (aka enclosed in the amniotic sac) the amnion detaches from the chorion and the baby comes out in the sac with the chorion still attached to the placenta. If the ...
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31 views

Are there insect species where the male occasionally attacks/eats the female after mating?

While I realize this would be a very ineffective propagation strategy, it could be an aberration that is occasionally observed in the same way that males are not always eaten. Could males "pretend" ...
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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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2answers
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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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1answer
56 views

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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1answer
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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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1answer
74 views

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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Are genes for producing heterozygotic twins sweeping?

The tendency for a woman to ovulate two or more eggs at once, which may results in a heterozygotic multiple births is the way I understand it at least to some part genetic. At least since the ...
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How do viable sperm persist for weeks?

Tests on men who have undergone vasectomies show viable sperm in their ejaculate weeks and dozens of ejaculations after ligation of their vas deferens. How is this possible? How long does a ...
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2answers
107 views

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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1answer
55 views

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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2answers
296 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 ...
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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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How can twins be born months apart? [closed]

How can twins be born months apart? What is the science behind it?
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Beyond anabolism, what are factors that restrict growth rate?

Beyond obvious constraints in the case of nutrient limitation, what can explain the relatively slow growth rate of cells in rich media? Lab strains of E. coli grow really, really fast. The cell ...
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1answer
847 views

What is the difference between monoecious and homothallic?

In my plant reproduction book there are two distinct definitions for these two terms, but when I read them I found out that they are very much alike that I was confused and couldn't catch the ...
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1answer
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Can different kinds of dogs mate?

This was inspired by a show in which two different kinds of dogs, who were neighbors, "dated," in order to bring their human neighbors together. This is a theme seen in Disney's "101 Dalmations" or "...
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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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2answers
542 views

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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1answer
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The reproduction patterns of fungi: what’s the difference between them?

I am going to take TOEFL, and am getting perplexed by the difference between cell division and budding and fragmentation of fungi. Those three terms seem like all the same all to me, so could anyone ...
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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. ...
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Fluoroquinolone mitochondrial and genomic DNA adduct

What could be possible consequences of covalent bond mitochondrial and genomic DNA adduct by Fluoroquinolones, our study was done by Fluoroquinolone Toxicity Study NFP. All 50+ participates who took ...
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2answers
195 views

In men, why do over 80% of sperm have abnormal form? [duplicate]

Here is the percentage of normal forms among fertile mens according to the centile (Source: Cooper et al. 2010): 2.5: 3% 5 (below this is Teratozoospermia): 4% 10: 5.5% 25: 9% 50 (median): 15% 75: ...
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1answer
485 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 ...
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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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1answer
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How long does each of the stages in meiosis take?

For each stages of meiosis (i.e. Interphase, Prophase I, ...), I wanted to know the time between each stages either in percentages or minutes. However, while I could find the cell cycle for mitosis ...

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