Y-linked genes are linked to the Y chromosome. They are not as usual as the X-linked genes and can only be expressed by men or males. Sons' phenotype: 100% hairy ears. Daughters' phenotype: 100% not hairy ears.
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What are sex-liked genes?</h3>
When talking about sex-linked genes, we refer to genes located in one of the sex chromosomes.
Being linked to one of the sex chromosomes means that these genes, and their corresponding alleles, will only be inherited together with the chromosome.
In general, genes are linked to the X chromosome. These are X-linked genes. In these cases, a male that inherits the X chromosome from a heterozygous female can express either the dominant or the recessive trait, depending on which allele it got from the mother.
However, some genes are linked to the Y chromosome and hence, inherited only by males or men. Traits coded by Y-linked genes will only be inherited by males.
In the exposed example, we are referring to an Y-linked gene, so it will only be inherited by sons and not daughters.
- Expected phenotypes of the man's sons ⇒ 100% haired ears
- Expected phenotypes of the man's daughter ⇒ 100% not haired ears
You will learn more about Y-linked genes at
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Answer:
The hormone levels decrease, and the next menstrual cycle begins with shedding of the uterine lining
Explanation:
I know for sure; I researched this because I have severe period side effects!
The bark of a tree is impervious to gases and water because bark cells are dead cells of the epidermis and compactly arranged without intercellular spaces. They contain a chemical called suberin in their walls that make them impervious to gases and water and it doesn't allow gases or water into the tree as bark cells are in the bark outer most layer of the tree.
