Questions tagged [reproduction]

The biological process by which new individuals are formed.

Filter by
Sorted by
Tagged with
0
votes
0answers
30 views

Evolution of the reproductive drive?

At some point in the early earth the right mix of biochemicals combine to form to first organisms(or maybe they came on a meteor). Regardless, I would assume the original unicellular organism did not ...
3
votes
0answers
48 views

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 ...
0
votes
1answer
27 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 ...
-1
votes
1answer
37 views

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?
1
vote
0answers
14 views

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, ...
1
vote
1answer
91 views

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?
0
votes
0answers
13 views

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 ...
0
votes
0answers
60 views

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 ...
0
votes
0answers
26 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" ...
1
vote
0answers
38 views

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'...
1
vote
2answers
27 views

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 ...
1
vote
1answer
48 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/...
0
votes
1answer
18 views

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 ...
0
votes
1answer
64 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. ...
1
vote
0answers
37 views

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:/...
4
votes
0answers
30 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 ...
0
votes
0answers
25 views

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 ...
0
votes
0answers
13 views

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 ...
1
vote
2answers
83 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?
0
votes
1answer
52 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 ...
1
vote
0answers
931 views

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?
5
votes
2answers
166 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 ...
2
votes
0answers
37 views

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 ...
1
vote
0answers
42 views

How can twins be born months apart? [closed]

How can twins be born months apart? What is the science behind it?
1
vote
0answers
19 views

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 ...
1
vote
1answer
454 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 ...
0
votes
1answer
46 views

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 "...
0
votes
0answers
25 views

Why sperms don't forms follicles

As all of us know that in meiosis oocyte forms follicles and egg cells, so my question is that if an oocyte can form follicles then why sperm cells do not forms the follicles? And in evolutionary ...
2
votes
0answers
39 views

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 ...
0
votes
0answers
25 views

How reliable is the life cycle information on PhagesDB?

If I'm understanding this correctly, PhagesDB users choose the Cluster/Subcluster during the upload, and the life cycle type is assigned solely based on this data. How reliable is that information? ...
1
vote
2answers
334 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 ...
0
votes
1answer
43 views

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 ...
3
votes
0answers
23 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. ...
1
vote
0answers
27 views

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 ...
0
votes
2answers
158 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: ...
1
vote
1answer
291 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
30 views

What fraction of species representatives is needed to say they have dispersed mating model?

Many biologists adopt the following division of mating systems: monogamous (and sometimes serial monogamous); polygynous; polyandrous; promiscuous/polygynadrous (sometimes distinguished as separate); ...
2
votes
0answers
31 views

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 ...
1
vote
1answer
601 views

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 ...
6
votes
1answer
110 views

Very frequent multiple births in humans

18th century Feodor Vassilyev is said to have had children by two wives, each of whom only ever had twins, triplets or quadruplets. His first wife has 16 sets of twins, 7 of triplets and 4 of quads; ...
1
vote
2answers
70 views

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

Let us say a somatic cell had a desired gene. This somatic cell was replicated during interphase so that it had two of the desired gene. It then underwent meiosis. My question then is, what is the ...
0
votes
1answer
1k views

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 ...
0
votes
1answer
74 views

Examples of points in evolution where two species stopped being interfertile? [closed]

Apologies in advance for not using the right terminology here; I'm not a biologist. This isn't for homework or anything; just curiosity. I'm wondering: at what point do two divergent species stop ...
1
vote
0answers
26 views

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?
2
votes
0answers
58 views

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 ...
2
votes
1answer
91 views

How do the chromosomes arrange themselves after fertilization in humans?

In human reproduction the male produces sperm containing 23 chromosomes and the female has the oovum containing 23 chromosomes , so after fertilization the zygote contains 46 chromosomes. What I want ...
0
votes
1answer
82 views

Does amount of sperm affect fitness of baby?

If there's a 3 day ovulation period in which to have intercourse, would it be better (to create a more fit/healthy baby) to have sex once and ejaculate more sperm than have sex three times with ...
1
vote
0answers
122 views

Has Epipremnum aureum lost its ability to reproduce sexually?

In this recent question the shy flowering nature of Epipremnum aureum (Golden Pothos) was discussed: Where can I find a picture of the inflorescence of Epipremnum aureum (golden pothos)? To ...
0
votes
1answer
350 views

Advantages of Monogamy over Polygamy and Vice Versa In Nature?

Some animals take on a single partner, possibly for life, while others have multiple partners over their lifetime, possibly even at the same time. What are the advantages to each approach, and how ...
1
vote
1answer
1k views

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 ...