Questions tagged [reproduction]
The biological process by which new individuals are formed.
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Is there potential to modify GM crops to inhibit their reproduction with non-GM crops?
I've been reading on terminator gene sequences and was wondering whether the same technology could be applied to GM crops to prevent transgene flow. Turns out Monsanto had developed the technology but ...
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Are Reproductive Hormones produced in both males and females identical or are they slightly chemically distinct?
Are Oestrogen, Testosterone, Luteinizing Hormone, and Follicle Stimulating Hormone exactly identical in both males and females?
For example, I know both males and females produce Follicle Stimulating ...
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How do male seashorses give birth? [duplicate]
It's a commonly known 'fun fact' that male seahorses are the ones that give birth, but that does not make sense to me. As far as I am aware, the biological definition of male and female relates to ...
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Why is antheridiophore not considered part of the sex organ while stamens including filament are considered a sex organ?
In the majority of websites and textbook I have referenced, the antheridiophore is considered to be the stalk which extends the sex organ (antheridium) in bryophytes. Meanwhile, in flowers, the whole ...
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Inheritance of child behavior based on daily life experiences of the parent
Our brain is a large network of neurons connected with each other.Our daily experiences change how our neurons are connected.Some experiences create better connections between two neurons A and B and ...
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What reproductive advantage do superhydrophobic spores bring?
Clubmoss plants produce spores that are superhydrophobic, meaning they will not mix with water. When you drop water on top of a whole bunch of these spores, the water will form tiny water droplets on ...
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Is there an ISO code for animal reproduction method?
Is there an ISO that can represent animals' reproduction method such as:
Oviparity, Ovoviviparous, Viviparous, and others?
Note: If the ISO term is not clear, here an example of an ISO: https://en....
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Is inhibin hormone secreted by corpus luteum in females?
In females, I have studied that corpus luteum secretes mostly progesterone, but some of estrogen, relaxin and inhibin too. But in some of the books they say that inhibin is not secreted by corpus ...
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Were these spiders burried alive by a spider wasp?
I moved a stone plate in the garden in europe, that was stored vertically, leaning against another one.
In the space between the two, I found some soil with small cavities filled with spiders.
Most ...
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Reproduction number in SAIQR model
$$ \dot S (t)=\Lambda-\beta_1 S(t)A(t)-\beta_2S(t)I(t)-\mu S(t)$$
$$ \dot A (t)= \beta_1 S(t)A(t)+\beta_2S(t)I(t)-(\mu+\alpha) A(t)$$
$$ \dot I (t)=\alpha A(t)-(\mu+\theta)I(t)$$
$$ \dot Q (t)=\theta ...
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Is Acer Palmatum Diecious, Monoecious, or another variety of ecious?
I am compiling information about plants in my garden, and studying botany for interest, and was wondering if anyone knows whether Acer Palmatum (and more broadly Acers in general) are monoecious, ...
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Is “random arousal” in humans still caused by/connected to “background” sex drive?
I’m not sure if the title is the best way to word the concept but I don’t know how else to put it briefly; though honestly this question itself might be a bit hard for me to communicate concisely in ...
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Crossbreeding mouse and chinchilla
The MGI Mouse Genome Informatics website states for the Mus musculus 129 strain, popular in biomedical research, that:
Origin: Dunn 1928 from crosses of coat colour stocks from English fanciers and a ...
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When shall we call a secondary Oocyte an Ovum?
My common sense tells me that once ovulation has occurred and the secondary Oocyte is out of the Ovary ,it should be called an Ovum, but my son's high school biology text book mentions a secondary ...
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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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Size ratio of Drosophila bifurca gametes and implication for the definition of sex
I recently learned that males of Drosophila bifurca species have gigantic sperm cells, 5.8 cm long and they only produce few hundred such cells during its lifetime. This made me wonder if the male ...
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What signals the corpus luteum to degenerate once the placenta is formed?
I've been trying to learn what causes the corpus luteum to finally degenerate once the placenta is ready to take over (in other words what is the trigger or signal and where is this signal produced) I'...
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Is the offspring of two-sex plants a clone or a child?
Many common plants e.g. tomato, pepper; produce both male DNA carriers and female embrions. In the case that the plant is confined alone, do the resulting seeds carry a carbon copy of the DNA of the ...
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Do monoecious plants have bisexual flowers?
I used to think that monoecious plants have male (unisexual) flowers and female (unisexual) flowers on the same plant but on different locations. But recently I learnt that monoecious plants also have ...
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What motivates an organism to reproduce? [closed]
What is the biological factor (gene or something else in case of humans) which motivates an organism to reproduce?
By reproducing the evolutionary success of an organism increases. But why would an ...
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Why Fertilisation occurs only in Fallopian tube?
The Ova is released and stops in the fallopian tube for the sperm..The Fertilisation occurs at the Fallopian tube, but as the zygote divides and forms an embryo, it attaches to the lining of uterus....
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When does a fetus become conscious?
I thought of asking this question in the Psychology & Neuroscience stack exchange, but I ultimately decided this would be a better stack exchange for it. When do the "lights turn on" in ...
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In the female reproductive system, is the labia minora / labia majora / labia as a whole the female counterpart of the scrotum in male?
I am confused about which labia is the counterpart of the male scrotum. Any help would be appreciated. My first question so pls try being more lenient with downvotes.
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Can anatomically modern human siblings have three decades of age gap?
In my story titled La Maison Sapiens, there is a HUGE nuclear family composed of the father, the mother, and their seventeen biological children.
To be exact, the male human being and the female human ...
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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 oogenesis have to begin in foetal stage itself?
In males, spermatogenesis begins after puberty and they retain this ability throughout their life time. However, in females, oogenesis begins and ends in the foetal stage itself and the female is ...
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How does the female body sense its own pregnancy?
I understand that after the fertilized ovum attached in the uterus the female body will not produce the required hormone surge for ovulation the next month. Therefore no new ovum will be sent down the ...
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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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Can all plants be reproduced through vegetative propagation?
I have learned that plants can be reproduced or propagated through vegetative parts but there is a question in my mind if we can each method for all types of plants. I don't know if all plants have ...
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Why is the process of releasing gametes in females different from that of males?
In context of humans, males produce sperms, store them (for few weeks? then regeneration?) and ejaculate them "on demand" but females can not do that. Females have an almost fixed pattern of ...
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What does this statement pertaining to fission mean?
I was reading about fission on Wikipedia when I encountered the following statement under Fission of prokaryotes section.
Like in mitosis (and unlike in meiosis), the parental identity is lost.
What ...
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In life history theory, does trade-off between reproduction and growth and maintenance imply longer health span for a sexually inactive organism?
The life history theory suggests that there exists trade-off between life processes like reproduction and growth and maintenance of the organism.
One significant trade off is between somatic effort (...
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Intersexual competition regarding energy investiture of offspring
A while ago I remembered reading about a species that had evolved so that the male sperm cells promoted the energy investiture of the female in this offspring upon fertilisation. Since this was a r-...
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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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Which varieties of Aurelia aurita do not have a polyp phase?
According to this "In some Aurelia aurita, the polyp stage does not exist.", but they don't cite anything. Is there a resource detailing life cycles of various jellyfish or do I have to find ...
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What happens to quality of breast milk when twins of two different sexes are born?
It says here in Scientific American
Mother's milk may be the first food, but it is not created equal. In
humans and other mammals, researchers have found that milk composition
changes depending on ...
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Using the law of independent assortment, why can't heterozygous parents make identical twins?
In a case where two parents are heterozygous, why can't any pairs of their children be identical twins? As the question asks, I tried to explain this using the law of independent assortment, which ...
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Do plants originate from a single cell
I read the generalization that life originates from a cell, and from my understanding animals, they originate from a single cell, produced as a result of sexual reproduction. And then life begins to ...
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Is there a name for the natural law that any population of a species will increase until it utilizes all available resources in the area it inhabits?
A squirrel population in a forest will only be as big as the available food source allows, and probably a little smaller after you account for predators, disease, etc. What is the name of the tendency ...
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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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How does a diploid sporophyte form in non-recurrent apomixis?
I came across this definition of non-recurrent apomixis which occurs in angiosperms-
In non-recurrent apomixis, both the egg-cell and embryo are haploid and embryo is developed directly from an egg-...
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Why do OX5034 GM mosquitos require the presence of tetracycline to survive? What does the drug do in this case?
I'm confused. Debug Fresno; why are the released mosquitos said to be sterile? from 2017 addresses male mosquitos released with a bacteria that will affect fertility of females after mating. They are ...
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How do honeybees requeen themselves?
It is said that beehives once queenless try to rear a new one by themselves. Beekeeping resources, books, websites, youtube videos, etc. have a very pragmatic human-centered view to the issue: what ...
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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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Do some animals have a tolerance to the negative effects of inbreeding?
Are some animals more or less tolerant to inbreeding? By tolerant I mean do they have a genetic mechanism that allows them to inbreed and corrects for issues introduced through this? When I started ...
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Is human zygote unicellular or multicellular [closed]
Is the human zygote which is formed by fusion of sperm and egg a unicellular structure? Bcz at some places the 2 celled stage which is formed due to cleavage has been labelled as the zygote. So is the ...
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Are there any species whose descendants can meet their ancestors from 100 generations back?
I.e. Humans can sometimes meet even their great-great-grandparents, but are there any species that can be alive at the same time as their great-great-……-great-grandparents? I imagine it would be those ...
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Check simple human fetus answers
Based on this image and questions, could someone please check my answers?
Question 1: At which one of the following points will the blood passing the point be more oxygenated after birth than before ...
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Does lack of adaptations for sperm competition necessarily shows the species are monogamous/serially monogamous/polygynous?
On the one hand adaptations for sperm competition, such as large testes, mate guarding, etc. are used to support that female in species are promiscuous.
On the other hand we know multiple eusocial ...
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Multiple fission and spore formation
I came across this question today. In the B diagram, zoospores of chlamydomonas is given. Now my doubt is, are the zoospores formed by multiple fission or spore formation? If it is by spore formation, ...
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