In Cattle the polled (hornless) condition (P) is dominant over the horned (p) phenotype. A particular polled bull is bred to 3 cows. With cow A, which is honred, a half calf is produced; with a polled cow B a horned calf is produced; and with honred cow C a polled calf is produced. What are the genotype of the bull and the three cows, and what phenotypic ratios do you expect in the offspring of the three matings?
2007-11-04 07:07:34 · 1 answers · asked by damigurl05 1 in Science & Mathematics ➔ Biology
not sure what halfcalf is... but probably means heterozygus
...in order to be horned they must have homozygus resessive pp
Bull Pp
Cow A pp calf A Pp 1/2 calfs will be polled
Cow B Pp calf B pp with this combination you know the bull and cow B must be heterozygus. calf is a 1/4 chance to be horned
Cow C pp calf C Pp this is the same situation as cow A
2007-11-04 07:35:28 · answer #1 · answered by chris b 6 · 0⤊ 0⤋