Biology, 27.01.2020 21:31 ptrlvn01

20. view the above sex-linked recessive pedigree. can you be certain of generation i, individual #1's
genotype? why or why not?
21. all males receive their x chromosome from their
22. how are sex-linked pedigrees different from autosomal pedigrees?

20. view the above sex-linked recessive pedigree. can you be certain of generation i, individu

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Answer from: randyg0531

The study of the diseases in a family over several generations is called pedigree analysis.

The pedigree analysis is given by T.H Morgan.

The genotype of the unknown person is X^bX^B

We can find the genotype of the unknown individual by crossing between two parents. The genotype is X^bX^B

.The sex chromosomes of the male and female are different. Male chromosomes are heterotypic and have different chromosomes that are XY, hence the Y chromosome is necessary to be male which is only received by the male Hence, males received the X chromosome from the females only.The sex-linked pedigree is different from the autosomal pedigree because it affects the person's sexual behavior.

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Answer from: Gunn2368

The genotype of the unknown individual is X^BX^b .

Males receive their X chromosomes from their mother.

They are not equally segregated among the male and female offsprings.

Explanation:

20. In case of the 1st pedigree problem, we can see that the male parent has the genotype of X^bY . And the female offspring has the genotype of X^BX^b . If the female gets the X^b from her father, then X^B has to be from the mother.

Now in the male offspring, the offspring gets the X^b from mother, because males get the X chromosome from their mothers. So the mother has the genotype of X^BX^b .

21. The males have the genetic setup of 44 +XY. They get the 44 chromosomes equally from both the parents - 22 from father and 22 from mother. And as the mother has only X chromosomes as the allosomes, then the offspring gets Y chromosome from their father and X chromosome from their mother.

22. In the autosomal characters, the males have both pairs of functional chromosomes, so the relationship of dominant and recessive acts very well. But in case of the allosomes, they have only X chromosomes as the functional one, Y chromosome doesn't have any functional gene. So the gene which is present in X chromosomes, whether dominant or recessive, gets expressed in males. But in females, there are two X chromosomes, so the dominant and recessive characteristics gets reflected there. So in case of presence of one recessive allele, they becomes carriers.

Answer from: Quest

chromosomes carry the genetic information for organisms. also, chromatin is the thread like dna which is located in the nucleus of an organism.

Answer from: Quest

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20. view the above sex-linked recessive pedigree. can you be certain of generation i, individual #1'...