Question

У лошадей вороной цвет зависит от доминантного гена В, а каштановый - от его рецессивного аллеля b. Аллюр рысью зависит от доминантного гена Т, а аллюр шагом - от его рецессивного аллеля t. Каким будет фенотип поколения F1при скрещивании гомозиготного вороного иноходца с гомозиготным каштановым рысаком? Какое потомство и в каких соотношениях будет получено при скрещивании двух особей F1

Answer 1

Вот решение. Запись, я дума, везде одинаковая.

Answer 2

Phenotype of F1 Generation

When a homozygous black horse (BB) is crossed with a homozygous chestnut horse (bb), the resulting F1 generation will have the genotype Bb. The dominant allele B determines the black coat color, while the recessive allele b determines the chestnut coat color. Therefore, the phenotype of the F1 generation will be black.

Phenotype of Offspring from F1 Cross

When two F1 individuals are crossed, the possible genotypes and phenotypes of the offspring can be determined using a Punnett square. In this case, both F1 individuals have the genotype Bb for coat color and the genotype Tt for gait.

The Punnett square for this cross would look like this:

    | Bb   | Bb   |
----|------|------|
Tt  | BT   | BT   |
----|------|------|
t   | Bt   | Bt   |

From the Punnett square, we can see that the possible genotypes of the offspring are BB, Bb, BT, and Bt. The corresponding phenotypes are black with a smooth gait (BB), black with a smooth gait (Bb), black with a pacing gait (BT), and black with a pacing gait (Bt).

The ratio of the phenotypes in the offspring will depend on the segregation of the alleles during gamete formation. In this case, since both parents are heterozygous for both coat color and gait, the expected phenotypic ratio in the offspring will be 1:1:1:1. This means that each phenotype is equally likely to occur in the offspring.

Therefore, the offspring from the F1 cross will consist of black horses with both smooth and pacing gaits, and the phenotypes will be observed in a 1:1:1:1 ratio.

Please note that the information provided here is based on the given genetic information and assumes that there are no other genetic factors influencing coat color or gait in horses.