In fruit flies (drosphilia), one eye color gene is x-linked, with a recessive white allele and a dominant red allele. if white eye female flies were bred to red eyed male flies, what would be the expected offspring (assume all parent toll flies are purebred)

XR          Y

XrXRXrXrY

Explanation:

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r: recessive white allele

R: dominant red allele

XX: female

XY: male

XrXr: white-eyed female. A possible gamete Xr  (

assuming a homozygous female)

XRY: red-eyed male. Possible XR and Y alleles.

50% of the offspring will be heterozygous female with red-eye phenotype (dominant)

50% of the offspring will be male with white eyes phenotype (recessive).

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the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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