Traits: tails& hair color in mice. Female are XX (ie., 2 X chromosomes),males are XY. Locus1: allele T = tails; t = no tails. Locus 2: allele B = black hair;b = white. Upper case letter is dominant. Parents & phenotypes: Males= no tails & white; Females = tails & black; bothsexes are true-breeding. F1 phenotypes: All tails &black; 50% male, 50% female. Parents mate & produce F1. The F1mice mate to produce the F2 generation of 800 mice, as per thetable:
______: Which gene locus, tail or hair, is sex-linked (ie., onthe X chromosome)?
(sex)______& (locus) _________: Which sex, male or female,is hemizygous for which gene locus?
# F2 generation mice
Sex
Hair
Tails
300
Female
Black
Yes
100
Female
Black
No
150
Male
Black
Yes
150
Male
White
Yes
50
Male
Black
No
50
Male
White
No
Traits: tails& hair color in mice. Female are XX (ie., 2 X chromosomes),males are XY. Locus1: allele T = tails; t = no tails. Locus 2: allele B = black hair;b = white. Upper case letter is dominant. Parents & phenotypes: Males= no tails & white; Females = tails & black; bothsexes are true-breeding. F1 phenotypes: All tails &black; 50% male, 50% female. Parents mate & produce F1. The F1mice mate to produce the F2 generation of 800 mice, as per thetable:
______: Which gene locus, tail or hair, is sex-linked (ie., onthe X chromosome)?
(sex)______& (locus) _________: Which sex, male or female,is hemizygous for which gene locus?
# F2 generation mice | Sex | Hair | Tails |
300 | Female | Black | Yes |
100 | Female | Black | No |
150 | Male | Black | Yes |
150 | Male | White | Yes |
50 | Male | Black | No |
50 | Male | White | No |
