In Drosophila while eyes is caused by a recessive Xlinked al

In Drosophila, while eyes is caused by a recessive X-linked allele. If a while-eyed female is crossed to a wild-type male, what proportion of female progeny will be expected to have white eyes? 33% 25% 100% 50% 0% In chickens (Gallus). barred (striped) feathers is dominant to solid-colored feathers, and this locus is on the Z chromosome. If a barred female is crossed with a solid male, what are the expected ratios of the offspring? 1 solid female: 1 barred male 1 burred female: 1 barred male 1 burred female: 1 solid male 1 barred female: 1 solid female: 1 barred male: 1 solid male 3 barred females: 1 solid female: 3 barred males: 1 solid male

Solution

9. d 0%

10. a. 1 barred male: 1 solid female

female determines the sex

11. e. male; intersex

XXY is a Klinefelter syndrome with two or more X chromosomes in males leading to sterility.

in drosophila, there is one sex chromosome and 3 autosomes.

XXXAAA-females, XYYAAA-males,XXYAAA-intersexes.

12. b

X chromosome inactivation is a process to equal the dose of x chromosome in both male and female cells.it prevents from having twice as many X chromosome products where one x chromosome in females is inactivated.

13. a, incomplete dominance

it gives a mixing effect of the two alleles which is intermediate to both giving rise to a new phenotype. incomplete dominance is a quantitative effect.

	Xw	Xw
XW	XwXW	XwXW
y	XwY	XwY