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4 years ago

how is the expression of sex linked genes both similar to and different from the expression of autosomal genes?

1 answer:

8 0

Since males have only x-chromosome they are more likely to express x-linked (by far the most common type of sex - linked disorders ) recessive traits. females can also not express any y-linked traits. females have a backup copy of the genes on their other x-chromosome, similar to autosomal chromosomes.

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3 years ago

The gene for flower position in pea plants exists as axial or terminal alleles. Given that axial is dominant to terminal, list a

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Answer:

A A

a Aa Aa

All the offspring have flower located at axial position

A a

A AA Aa

a Aa aa

Three offspring with genotype i,e Aa, Aa and Aa will have flower located at axial position

Only offspring with genotype "aa" will have flower located at terminal position

Explanation:

Let the allele "A" represent the characteristics of axial position of flower

Let the allele "a" represent the characteristics of terminal position of flower

Given -

"A" is dominant over "a"

F1 generation -

Two parents with homozygous genotype for both A and a are crossed . The punnet square for the cross between "AA" and "aa" is as follows -

A A

a Aa Aa

Thus the genotype of offspring is "Aa"

Since, "A" is dominant over "a", all the offspring have flower located at axial position

F2 generation-

The cross between two parents having heterozygous genotype "Aa" will take place .

The punnet square for the cross between "Aa" and "Aa" is as follows -

A a

A AA Aa

a Aa aa

Three offspring with genotype i,e Aa, Aa and Aa will have flower located at axial position

Only offspring with genotype "aa" will have flower located at terminal position

8 0

3 years ago