Question

определите фенотип первого поколения в семейной паре-гомозиготный мужчина с прямыми волосами и гетерозиготная женщина с волнистыми волосами,если известно,что ген кудрявых волос доминирует над прямыми волосами.

Answer 1

Ответ:

Итак из задачи видим что волнистые волосы это промежуточный признак

P ♀️Aa(волнистые волосы) × ♂️аа( прямые волосы)

G A a a

F Aa(кудрявыеволосы); аа( прямые волосы)

Объяснение:

АА кудрявые волосы

Аа волнистые волосы (промежуточный признак)

аа прямые волосы

Answer 2

Phenotype of the First Generation in a Family Pair

In a family pair consisting of a homozygous man with straight hair and a heterozygous woman with wavy hair, we can determine the phenotype of their first generation offspring based on the known dominance relationship between the curly hair gene and the straight hair gene.

The dominance relationship states that the gene for curly hair is dominant over the gene for straight hair. This means that if an individual has at least one copy of the curly hair gene, their hair will be curly. On the other hand, an individual needs to have two copies of the straight hair gene to have straight hair.

Given that the man is homozygous for straight hair (meaning he has two copies of the straight hair gene) and the woman is heterozygous for wavy hair (meaning she has one copy of the curly hair gene and one copy of the straight hair gene), we can determine the possible genotypes and phenotypes of their offspring.

The man's genotype is SS (two copies of the straight hair gene), and the woman's genotype is CsS (one copy of the curly hair gene and one copy of the straight hair gene).

To determine the possible genotypes and phenotypes of their offspring, we can use a Punnett square. In this case, the Punnett square would look like this:

| | S | S | |------|---------|---------| | C | Cs | Cs | | s | Ss | Ss |

From the Punnett square, we can see that there are two possible genotypes for the offspring: CsS and Ss.

Based on the dominance relationship between the curly hair gene and the straight hair gene, the phenotype of the offspring will be as follows:

- Offspring with the genotype CsS will have curly hair because they have at least one copy of the curly hair gene. - Offspring with the genotype Ss will have straight hair because they do not have any copies of the curly hair gene.

Therefore, the phenotype of the first generation in this family pair will consist of individuals with both curly hair and straight hair.

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