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Questions tagged [sex-chromosome]

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Barr body. How does it work?

Barr's body is a spiral X chromosome. If I'm not mistaken, one random chromosome (a healthy woman) is inactivated in each cell. Which X chromosome is inactivated in a given cell is random. I've heard ...
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1answer
31 views

Why is Turner's syndrome a problem? [duplicate]

So Turner's syndrome is a chromosomal defect where one of the X chromosomes is missing. For more details visit the [Wikipedia page] (https://en.m.wikipedia.org/wiki/Turner_syndrome). But I don't ...
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Why is there Turner syndrome if one of the X chrosomes is inactivated anyway?

In females one of the two X chromosomes will condensate and turn into Barr bodies. So chromosome abnormality-free women will only have a single transcriptionally-active chromosome. Then why can ...
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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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Coefficient of relatedness for a locus on the Z chromosome

So i know that the ZW determination system is the equivalent for XY in birds. Moreover, I know that the coefficient of relatedness between siblings for the X chromosome is 0.5 so im guessing that the ...
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For X-linked recessive diseases, why are only a third of alleles under selection pressure?

My professor wrote the following on one of his lecture slides: For X-linked recessive disease, only a third of the mutant alleles are under selection pressure, so if the disease incidence is stable, ...
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1answer
18 views

Meiosis pairing of chromosomes

How do the X and Y chromosomes synapse during the zygotene stage of when they have almost no homology between them?
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2answers
94 views

What is the X-chromosome responsible for? [closed]

I understand that the X-chromosome is responsible for certain disorders, like red-green colorblindness; but besides disorders, what do the genes on the X-chromosome determine?
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3answers
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What processes regulate the sex of offspring?

It is known that some species are more likely to born male than female (and some maybe vice versa). I understand that it is due to evolutionary perspective (average number of adult males is close to ...
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Number of alleles' variations in a mushroom that has over 20,000 sexes

I am trying to understand the mating behavior of a particular species of fungi known as Schizophyllum commune, or the split-gill. I found a blog post that explains the mechanisms that define the ...
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32 views

Assymetry in chromosomes and evolutionary importance

I am trying to understand what is the significance of asymmetry/symmetry in the chromosomes. For instance, in humans in the female population the chromosomes are symmetrical in contrast to the male ...
6
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1answer
131 views

Why are X-linked illnesses less common in females if females have X-chromosome inactivation anyway?

I have read this post but am still slightly confused about this. Do tissues in the human body not all develop from the same cell(s) in the embryo? If so, I do not see how the cell 'mosaic' would be ...
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1answer
246 views

Sex linked genes?

I am learning about genetics and sex-linked traits. All of the X-linked traits we have considered (eye colour in Drosophila, Duchene Muscular Dystrophy to name a couple)follow the rule that, a female ...
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1answer
180 views

Why does the cloned cat, CC, exhibit mosaic fur color?

Since fur color in this cat is from a sex-dependent gene, I see how calico cats occur. However, I don't fully understand why it happens in cloned cats. When the cat is cloned, the DNA is taken from a ...
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1answer
5k views

When was it discovered XY chromosomes decide the sex of a child in humans?

Several stories are told from before-genetic-age (books and movies are my reference, the one present in my mind is Marie-Antoinette by Copola) in which we can always see that women are blamed for ...
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1answer
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Can a Turner syndrome patient develop male characteristics artificially?

From an answer to the question Can stem cells from male convert to cells of female-only organs, and vice versa? Y chromosome is the sex determining chromosome with SRY gene that determines testes ...
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What would the resulting karyotype be if someone with Klinefelter syndrome fertilized an “empty” egg?

Endoreduplication: is a form of nuclear polyploidization that results in multiple, uniform copies of chromosomes. This process is common in plants and animals, especially in tissues with high ...
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1answer
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Are all Y-chromosomes the same?

Since the Y-chromosome can only pass from male to male child, it would seem to pass intact. Thus, a boy's Y-chromosomes would, I guess, be the same as his father's. Going backwards, would not all men ...
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1answer
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Can sexual selection operate in temperature dependent sex determining organisms?

Or more broadly, are distinct forms of genetic inheritance (ie. sex chromosomes) needed for sexual selection? My thinking was that since there are no sex determining loci, there could not be linkage ...
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2answers
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Why are the sex chromosomes called X and Y?

Is there a specific reason that the letter Y is used as the symbol for the male chromosome and X is used for the female chromosome?
3
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1answer
144 views

Sex biased gene expression in the X chromosome

It has been shown that the X chromosome is frequently enriched for female biased genes, and has a deficit of male biased genes. For example in this paper, and this one. However, I'm struggling to ...
3
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1answer
252 views

From a computer science perspective, how is DNA compared for various purposes?

I am very interested in privacy preserving technolgies, such as Microsoft PINQ and would like to see if this is applicable to DNA comparison. Given that I don't have a background in biology, I ...
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1answer
5k views

Crossing white eyed Drosophila with sepia eye

So, I'm doing some drosophila experiments with my high schoolers and I had really poor production of wild type individuals for doing the experiment resulting in not enough to cross with everyone... I ...
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2answers
12k views

What effect does the Barr body have, in relation to female Turner syndrome?

Why do persons with Turner syndrome have developmental abnormalities, when normal XX-females do not, even though they only have 1 active X chromosome? From what I know, one X-chromosome is ...
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2answers
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Do males of all sexual species have Y chromosomes?

I know for instance some cells are sexual, so, this got me wondering, do the males of all species that have distinct sexes have Y chromosomes?
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0answers
112 views

Imperfect dosage compensation

Dosage compensation is used to make up for different copy numbers of the major sex chromosomes in males and females (One X or Z chromosome in one and two in the other). Two main mechanisms of dosage ...
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0answers
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Why is gynodioecy common and androdioecy rare?

Gynodioecy is when a population features individuals that produce both male and female gametes and individuals that produce just female gametes. Androdioecy is when a population features individuals ...
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1answer
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Defining dominance and selection in these formulae

This paper uses two equations to explain the different conditions under which sexually antagonistic genetic variance is maintained in a population, while allowing for unequal dominance, for ...
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Does unequal dominance mean the X-chromosome should be a coldspot for antagonistic variation?

Sexually antagonistic genetic variation, in a simple model, will persist if the benefit to one sex is (near) equal to the cost in the other, otherwise the polymorphism will be selected out of the ...
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1answer
83 views

Which sex is homogametic in side-blotched lizards?

I'm just trying to find out whether the male side-blotched lizard is the hetero- or homogametic sex in side-blotched lizards (Uta stansburiana) - some reptiles are ZW system (female heterogamete) and ...