There is a rare Y-linked trait called hairy cars. Individuals with this trait ha
ID: 176039 • Letter: T
Question
There is a rare Y-linked trait called hairy cars. Individuals with this trait have hair growing on the pinnae of the ears in some eases it is quite thick; in others it is only one or two long hairs. There are very few genes with common variations located on the Y chromosome. One gene located on the Y chromosome is testes determining factor (TDF). Another is the gene sequence for hairy ears. There is also a "pseudo-autosomal region" of the Y chromosome that shares a few of the same genes found on the X chromosome. What is the probability of an affected father passing the hairy car trait to his oldest daughter? What is the probability of an affected father passing the hairy ear trait to his youngest son? A son has the same trait as his father and his maternal grandfather, but not his paternal grandfather. Could this trait be Y-linked? Explain. Can a Y-linked trait "skip" a generation and reappear in the next generation?Explanation / Answer
1.Ans. 0%- No Chance
effected father can not transmit this trait to any of his daughters. because it is Y-linked trait it neve passed from father to daughter, Daughters only have X-chromosomes, from the father one X-chromosome will pass to their daughter and Y-chromosome pass to sons.
2.Ans.100%
effected father transmit this trait to all of his sons. because it is Y-linked trait, if is passed from father to son. son have one X-chromosome and one Y-chromosome, and inherit X-chromosome from the mother and Y-chromosome from the father. so whatever traits on Y-chromosome is expressed in males.
3.Ans. son inherit the trait from father so it is Y-linked. in Y-linked traits there is no influence of meternal family, because mother will not get Y-chromosome from his father.
4.Ans.No.. there is No skip generation in the Y-linked traits. these traits are expressed in every generation because males have only one Y-chromosome, the trits are expressed in every generation.
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