Question

если у человека волнистые волосы доминируют над прямыми, а черный цвет волос над светлыми какое потомство можно ожидать в следующих скрешиваниях. 1) Отец дигетерозиготный с темными волнистыми волосами, а мать рецессивная дигозигота 2) отец светловолосый и гетерозиготен по гену волности, а мать темноволосая гомозигота с прямыми волосами 3) отец гомозиготен по обоим генам, при этом у него светлые и волнистые а мать дигетерозигота 4) отец рецессивная дигомозигота а мать дигетерозигота.

Answer 1

1) Волнистые светлые

2)Светловолосый с прямыми

3) Светлые волнистые

4) Темные прямые 

Answer 2

Inheritance of Hair Type and Color

When it comes to the inheritance of hair type and color, it is important to understand the basic principles of genetics. Hair type is determined by the presence or absence of a specific gene, while hair color is influenced by multiple genes.

In humans, there are two main types of hair: straight and wavy/curly. The gene responsible for hair type is called the "WNT10A" gene. This gene has two alleles: one for straight hair (S) and one for wavy/curly hair (W). The straight hair allele (S) is dominant over the wavy/curly hair allele (W), meaning that if an individual has at least one copy of the straight hair allele, they will have straight hair.

Hair color, on the other hand, is influenced by multiple genes, including the MC1R gene. The MC1R gene has different alleles that contribute to different hair colors, such as black, brown, blonde, and red.

Now, let's analyze the different scenarios you provided:

1) Father is heterozygous with dark wavy hair, and mother is recessive homozygous with straight hair: - The father has one copy of the straight hair allele (S) and one copy of the wavy/curly hair allele (W). - The mother has two copies of the straight hair allele (SS). - In this case, all the offspring will inherit one copy of the straight hair allele from the mother (S) and one copy of the wavy/curly hair allele from the father (W). Therefore, all the offspring will have wavy/curly hair.

2) Father is light-haired and heterozygous for hair type, and mother is dark-haired and homozygous for straight hair: - The father has one copy of the straight hair allele (S) and one copy of the wavy/curly hair allele (W). - The mother has two copies of the straight hair allele (SS). - In this case, there is a 50% chance that each offspring will inherit the straight hair allele (S) from the father and a 50% chance that they will inherit the wavy/curly hair allele (W). Therefore, the offspring will have a mix of straight and wavy/curly hair.

3) Father is homozygous for both hair type alleles (SW), and mother is heterozygous (DW) with both hair types: - The father has one copy of the straight hair allele (S) and one copy of the wavy/curly hair allele (W). - The mother has one copy of the straight hair allele (S) and one copy of the wavy/curly hair allele (W). - In this case, there is a 50% chance that each offspring will inherit the straight hair allele (S) from either parent and a 50% chance that they will inherit the wavy/curly hair allele (W) from either parent. Therefore, the offspring will have a mix of straight and wavy/curly hair.

4) Father is recessive homozygous for hair type (WW), and mother is heterozygous (DW) for both hair types: - The father has two copies of the wavy/curly hair allele (WW). - The mother has one copy of the straight hair allele (S) and one copy of the wavy/curly hair allele (W). - In this case, there is a 50% chance that each offspring will inherit the straight hair allele (S) from the mother and a 50% chance that they will inherit the wavy/curly hair allele (W) from either parent. Therefore, the offspring will have a mix of straight and wavy/curly hair.

It's important to note that these predictions are based on the principles of Mendelian genetics and assume that there are no other genetic factors influencing hair type and color. In reality, hair type and color can be influenced by multiple genes and can vary significantly among individuals.