10. Imagine a cross between an ash-red female EE, Z(BA)W, and a recessive red ma

Question

10. Imagine a cross between an ash-red female EE, Z(BA)W, and a recessive red male that is homozygous for the blue allele of Tyrp1 ee ZB-)Z(B). What would the genotypes and phenotypes (include color and sex), of the F1 progeny be? (Punnett square or branch diagram can be helpful...). Remember Mendel's laws! 11. If the F1 progeny from the above question are intercrossed, what would the genotypes and phenotypes (include color and sex) of the F2 progeny be? (Again, a Punnett square or branch diagram will be VERY helpful)

Explanation / Answer

It a ZW sex-determining system which determines the sex of offspring in bird, fish, and crustacean. This system is ovary dependent not a sperm dependent (like the sex-determining case in human) In this system ZZ determine a male sex and ZW represents a female.

Let's talk about color, ash-red is dominant over blue as problem suggest B+ is recessive allele for blue whereas BA is dominant allele for ash-red, therefore, BA BA and BA B+ will give dominant phenotype and will produce ash-red colour, whereas, B+ B+ will give recessive phenotype and produce blue colour

10)

                        

           

Z(B+)

Z(B+)

Z(BA)

Z(BA) Z(B+)

male,ash-red

Z(BA)Z(B+)

Male,ash-red

W

Z(B+) W

Female,blue

Z(B+) W

Female,blue

11) In F1 generation we got the female genotype   Z(B+) W and male genotype Z(BA)Z(B+)

                        

           

Z(BA)

Z(B+)

Z(B+)

Z(BA) Z(B+)

male,ash-red

Z(B+)Z(B+)

Male, blue

W

Z(BA) W

Female, Ash-red

Z(B+) W

Female,blue

                        

           

Z(B+)

Z(B+)

Z(BA)

Z(BA) Z(B+)

male,ash-red

Z(BA)Z(B+)

Male,ash-red

W

Z(B+) W

Female,blue

Z(B+) W

Female,blue

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