Question

У собак ген чорного кольору шерсті (A) домінує над кавовим (а), а короткої шерсті (В) — над довгою (в). Від схрещування чорної короткошерсної самки з чорним короткошерстим самцем отримали три чорних короткошерсті щеняти і одне чорне довгошерсте щеня. Визначте генотипи батьків'і потомства?

Answer 1

Ответ:

Три чорні короткошерсті щенята свідчать про гомозиготність обох батьків за алеллю A. Одне чорне довгошерсте щеня може бути результатом гетерозиготності батьків за алеллю B, тобто їх генотипи можуть бути AB та Ab.

Отже, генотипи батьків можуть бути наступними:

чорна короткошерста самка: AA BB або Aa BB

чорний короткошерстий самець: AA BB або AA Bb

Объяснение:

Answer 2

Inheritance of Coat Color and Length in Dogs

In dogs, the inheritance of coat color and length is determined by genes. Different genes control the color and length of the coat. Let's analyze the given information and determine the genotypes of the parents and the offspring.

According to the information provided, the coat color gene (A) for black color is dominant over the coat color gene (a) for coffee color. Additionally, the coat length gene (B) for short hair is dominant over the coat length gene (b) for long hair.

The given cross is between a black, short-haired female (AA BB) and a black, short-haired male (AA BB). From this cross, three black, short-haired puppies (AA BB) and one black, long-haired puppy (AA bb) were obtained.

Based on this information, we can determine the genotypes of the parents and the offspring as follows:

- Female (AA BB): The female is homozygous dominant for both the coat color gene (A) and the coat length gene (B). - Male (AA BB): The male is also homozygous dominant for both the coat color gene (A) and the coat length gene (B).

The offspring are as follows: - Three black, short-haired puppies (AA BB): These puppies inherited the dominant alleles for both coat color (A) and coat length (B) from both parents. - One black, long-haired puppy (AA bb): This puppy inherited the dominant allele for coat color (A) from both parents but inherited the recessive allele for coat length (b) from one parent.

To summarize: - Female genotype: AA BB - Male genotype: AA BB - Offspring genotypes: - Three black, short-haired puppies: AA BB - One black, long-haired puppy: AA bb

Please note that this analysis is based on the information provided and assumes that the coat color and length in dogs are controlled by simple Mendelian inheritance patterns. In reality, the inheritance of coat color and length can be more complex, as multiple genes and other factors can influence these traits.