the major color gene in pigeons is sex-linked and located on the z chromosome. The W chromosome has no color gene. Blue is dominant to brown. If you cross a brown female with a heterozygous blue male, what would the outcome be?
Added by Anthony B.
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In pigeons, the major color gene is sex-linked and located on the Z chromosome. Since it's sex-linked, we need to remember that male pigeons have a ZW sex chromosome pair (with Z being from the father and W from the mother), and female pigeons have a ZZ sex Show more…
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The inheritance of color in domestic pigeons involves several genes. The dominance hierarchy of three color alleles is ash-red, blue-black, and brown (ZA > ZB > Zb). These colors are carried on the Z sex chromosome. Unlike humans, female pigeons have two different sex chromosomes (Z and W), and males have two of the same kind of sex chromosome (ZZ). A heterozygous blue-black male pigeon mated with a brown female pigeon. What are the expected genotypes of the offspring? Select one: a. ZBZ b, ZbZb, ZBW, and ZbW b. ZBZb and ZbW c. ZBZB, ZBZb, ZbZb, ZBW, and ZbW d. ZAZb, ZBZb, ZBW, and ZAW
Bryan V.
In pigeons, the B gene is located on the Z chromosome and comes in three main alleles: B^A (ash-red), B^+ (blue), and b (brown), shown in their order of dominance. Predict the outcome of a cross between a blue female and an ash-red male that is a carrier of the brown allele. Both parents are heterozygous for the recessive red mutation (Ee), which shows recessive epistasis over the B gene. Be sure to describe the phenotypic proportions of the offspring, including both color and sex.
Madhur L.
In pigeons, the dilute and color are genes on the Z-chromosome that determine how feathers look. Remember that the Z-chromosome is a sex chromosome. Males are ZZ and females are ZW. The dilute gene has two alleles D (dominant: dark feathers) and d (recessive: light feathers). The color gene has three alleles: R (red: most dominant), B (blue: next most dominant), b (brown: recessive). The two genes are linked and are about 30 cM apart. a) What gametes will a Z^BD/Z^bd pigeon make? b) Draw Metaphase I for the pigeon in part (a) assuming crossing-over does occur between the two genes. c) If you cross the pigeon in part (a) with a Z^bd/W pigeon, what will be the frequencies of offspring genotypes and phenotypes?
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