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Questions tagged [reproduction]

The biological process by which new individuals are formed.

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What is the probability of transmission a genetical feature of a particular organism to another organism? [duplicate]

What is the probability that a specific feature of an organism will be transferred to the after generation? What are the ways of artificially doing it? What are the factors that play a major role in ...
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Expected population growth.

If a species has the following properties -average lifespan: 1000 years -average time between births:100 years -average age of maturity:100 years -current population 1000(adults) 10(children) Would ...
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Why is the sperm treated as a foreign object by the female's body?

I've always had this doubt, isn't it an evolutionary disadvantage that the sperm is treated as a foreign object by the uterus of the woman, and that immune responses are initiated against the sperm? ...
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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
89 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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33 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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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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Spider goat cloning

Can someone explain to me about spider goat cloning and it's purpose /function in the simplest way that even the stupidest person like me can understand
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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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Why did the menstrual cycle evolve to be a wasteful process? [duplicate]

Why did primates evolve its menstrual cycle to be such a wasteful process;Why did not a more efficient system develop which did not waste the resource in this manner?
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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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What triggers the formation of slime-mold fruiting body?

I have attached a picture of this slime mold fruiting body which I took in my own yard. It is Mid-Summer (August), the air is humid but no rains. Earlier this month, a smaller one has appeared in one ...
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89 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; ...
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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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1answer
134 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
62 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 ...
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1answer
75 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 ...
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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
121 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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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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Sexual reproduction in plants

The female gametophyte of angiosperms is 7 celled and 8 nuclear. My question is Is it possible for the male gamete to fuse with the other haploid cells rather that the egg cell?
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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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1answer
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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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1answer
226 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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Are seeds alive and by what mechanism do they 'Spring back to life'?

Correct me if I'm wrong but, human and plant cells require, at least to my understanding, a supply of energy, water and other neutrients to survive and carry out functions (such as sell division). ...
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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
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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
38 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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Fruit-producing water plant

Are there any water plants that grow fruit that is meant to be eaten? I’m specifically interested in plants that are not rooted permanently to the earth but are mobile for at least part of their life ...
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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 ...
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178 views

Could two women have a child through artificial insemination/genetic engineering?

This is something I just thought of while looking up stuff about matriarchies. I recall a comic series I heard of once, I think it was called 'Y, the last man'. In that story, all males (besides the ...
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1answer
32 views

Sugar metabolism in preserved/cryopreserved livestock semen

I wonder how can semen use di/tri-saccharide (e.g. sucrose, trehalose, raffinose) for spermatozoa metabolism in preservation/cryopreservation of livestock semen, since the semen itself never bring any ...
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1answer
41 views

Requirements for ability to reproduce

In my (albeit basic) biology classes in the past, we've learned about how, to reproduce, two organisms must have the same number of chromosomes. This has been verified by a few other websites I found. ...
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2answers
288 views

Do chromosomes change with time?

An offspring is 23 chromosomes of mother and 23 of father, if one of the mate learns say music after the birth of their first child— will their second offspring have better music skills than former? ...
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Ratio boys:girls born - how to explain? [duplicate]

My son studies genetics at school right now and they have been covering gender. It's well known that slightly more boys are born than girls. However, originally there's an equal number of sperm cells ...
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Do ovaries produce estrogen before menarche?

It is traditionally taught that estrogen is produced by the granulosa cells of the follicle. But before menarche, where does the estrogen come from? Is it from the thin layer of granulosa cells lining ...
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1answer
606 views

What animal has the longest juvenile period?

I just heard the following complaint from a comedienne. Humans are the only animal that is completely useless for the first twenty five years of life. Obviously this is just a joke but it is true ...
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1answer
43 views

How plausible would it be for animals to normalize the birth of monozygotic twins in their reproductive cycles? [closed]

I'm currently trying to develop the world of a sci-fi story I'm working on, and a concept I've thought of adopting with the environment and characters is a common breeding system where identical twins ...
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1answer
95 views

Exact meaning of the term “clutch”

When reading a Wikipedia article to do with chickens, I have come across the term "clutch", but I was not able to entirely figure out what this word means. I was wondering whether the term clutch can ...
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1answer
124 views

Can 2 people give rise to billions? Adam and Eve 2.0 [closed]

With with the advancement of GMOs the idea of giving rise to humans from 2 people is possible making questions like this invalid? How many people are required to maintain genetic diversity? With ...
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1answer
72 views

How is it possible for a new species to evolve? [closed]

Suppose a new species is created from a random mutation that happened during an instance of reproduction in an existing species. How can that new species survive and flourish if there only exists one ...