Problem 2: Determine the possible traits of the calves if a white (WW) bullis mated
with a roan (RW) cow.
1. What are the possible genotypes of the offspring?
2. What are the possible phenotypes of the offspring?
Answers
Answer:
What are the possible genotypes of the offspring?
Genotype is also used to refer to the pair of alleles present at a single locus. With alleles 'A' and 'a' there are three possible genotypes AA, Aa and aa. With three alleles 1, 2, 3 there are six possible genotypes: 11, 12, 13, 22, 23, 33. First we must appreciate that genes do not act in isolation.
What are the possible phenotypes?
The possible human phenotypes for blood group are type A, type B, type AB, and type O. Type A and B individuals can be either homozygous (IAIA or IBIB, respectively), or heterozygous (IAi or IBi, respectively).
Explanation:
1. The possible genotypes are roan (RW) calves and white (WW) calves.
2. The possible phenotypes are roan (RW) calves and white (WW) calves.
Explanation:
When roan (RW) cow mates with white (WW) bull, the genes formed are the combination of R, W (roan) and W, W (white).
1. When R gene of roan cow mates with W gene of white bull gives a combination of RW ; that is roan type of calf. Such a way two phases will be formed from the other gene of the bull.
2. When W gene of roan cow mates with W gene of white bull gives a combination of WW; that is white type of calf. Such a way two phases will be formed from the other gene of the bull.
3. Therefore, two roan type calves and two white type calves can be produced.