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Questions tagged [reproduction]

The biological process by which new individuals are formed.

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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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How long do sperm live outside of the human body ? Is it minutes hours or days? [on hold]

How long do sperm last when they aren’t in a body ? in air on on a sheet , etc
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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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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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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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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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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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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 ...
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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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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? ...
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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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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
118 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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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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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); ...
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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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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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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; ...
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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 ...
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720 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 ...
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1answer
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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 ...
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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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1answer
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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 ...
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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 ...
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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 ...
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1answer
270 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 ...
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1answer
654 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 ...
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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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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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When is Semelparous reproduction most likely to be favoured?

Under which of the following conditions is Semelparous reproduction (where organisms produces all its offspring in a single reproductive event) is most likely to be favoured? (A) Adult survival rate ...
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358 views

Genotypes of gametes produced by an F1 individual?

I have an urgent question as I have an exam tomorrow. I was skimming some past exam papers and one question came up which has me completely confused. A cross was made between a pure breeding ...
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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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How diverse are the sperm cells of an individual male due to random mutations?

Due to the sheer number of sperm cells in an individual and the rate of mutations, are they likely to be incredibly diverse and encompass most of what we see across our species? For instance would it ...
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1answer
98 views

Minimum age to reproduce [closed]

How old does one (male and female human) have to be in order to reproduce Im thinking that it's 13 for a boy and 3 for a girl, is that right?
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I am looking for examples of polyandrous insects?

This is for a homework assignment, and yet I am not able find any references that can help me find example of polyandrous insects. Does anyone have any references or suggestions on where to look?
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1answer
39 views

Harvest honey without damaging brood cells [closed]

I want to make a homemade beehive, I want to know how to differentiate honey cells and brood cells, therefore, I'd like to know how can I organize the beehive so bees will create honey and brood cells ...
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1answer
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What are these little leaves growing on these other leaves? (plant growing near the ocean)

I saw many of these plants while hiking on a hill facing the ocean in northern Taiwan. I've included a snapshot of a nearby part of the same trail to show it's rugged, wet, green, and rocky, and ...
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2answers
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Human ancestor reproduction after chromosome fusion

I read somewhere that human chromosome 2 is the result of 2 primate chromosomes fusing together somewhere along our evolutionary journey. This is why we have 23 chromosomes while other primates have ...