Question

У кур черная окраска-А, бурая-а; наличие хохолка-В, отсутствие -b. Курица и петух чёрные и хохлатые . В F1 всего получено 13 цыплят, из них 7 чёрных хохолатых, 3 бурых хохлатых, 2 чёрных без хохолка и 1 бурый без хохолка. Описать все генотипы.

Answer 1

оба дигетерозиготы все на рисунке показано решение

Answer 2

Genotypes of Chickens

To describe the genotypes of the chickens, we need to understand the inheritance patterns of the different traits mentioned in the question. Let's break down the information provided:

- Black feather color (A) is dominant over brown feather color (a). - The presence of a crest or topknot (V) is dominant over the absence of a crest (v).

Based on this information, we can determine the genotypes of the chickens in the F1 generation.

1. Black and crested chickens (black and topknot): - These chickens can have two possible genotypes: AVV or AVv. Both genotypes would result in black feather color and the presence of a crest.

2. Brown and crested chickens (brown and topknot): - These chickens can have the genotype Aav. This genotype would result in brown feather color and the presence of a crest.

3. Black chickens without a crest (black and no topknot): - These chickens can have the genotype AVv. This genotype would result in black feather color but the absence of a crest.

4. Brown chickens without a crest (brown and no topknot): - These chickens can have the genotype Aav. This genotype would result in brown feather color and the absence of a crest.

Now, let's analyze the information provided in the question:

- Out of the 13 chicks in the F1 generation: - 7 chicks are black and crested (AVV or AVv). - 3 chicks are brown and crested (Aav). - 2 chicks are black without a crest (AVv). - 1 chick is brown without a crest (Aav).

Based on this information, we can conclude the following genotypes in the F1 generation:

- 7 chicks are AVV or AVv (black and crested). - 3 chicks are Aav (brown and crested). - 2 chicks are AVv (black without a crest). - 1 chick is Aav (brown without a crest).

Please note that the genotypes provided here are based on the information given in the question and the assumed inheritance patterns for feather color and crest presence.