Question

Цвет кожи негров определяется двумя парами генов ААВВ, цвет кожи белых – аллелями аавв. Мулаты имеют различной степени промежуточный цвет кожи. Какой будет цвет кожи у детей от брака негра и мулатки (АаВв)?

Answer 1

AABB x AaBb

AA Aa BB Bb Расщепление 50%

 50% негр. 50% мулат

Answer 2

Genetics of Skin Color

The skin color of individuals is determined by multiple genes, with variations in these genes leading to the wide range of skin tones observed in human populations. In the case of the specific genetic combinations mentioned in the question, the inheritance of skin color follows certain patterns.

1. Genetic Makeup of Individuals: - The skin color of individuals is determined by two pairs of genes: AABB for darker skin color and aabb for lighter skin color. - When a person has a combination of these genes, such as AaBb, they may exhibit an intermediate skin color due to the presence of both dominant and recessive alleles.

2. Offspring's Skin Color: - In the case of a marriage between a person with the genetic makeup AABB (representing a darker skin color, such as a person of African descent) and a person with the genetic makeup AaBb (representing an intermediate skin color, such as a mulatto), the offspring's skin color can be predicted using Punnett squares. - The Punnett square for this cross would yield offspring with the genetic makeup AaBb, resulting in an intermediate skin color due to the combination of dominant and recessive alleles. - The specific ratio of offspring with different skin colors can be determined using the Punnett square, with the potential for a range of skin tones in the offspring.

3. Variation in Offspring's Skin Color: - It's important to note that while the Punnett square provides a predicted ratio of offspring with different skin colors, the actual skin color of the offspring can vary due to the complex nature of genetic inheritance and the influence of other genetic factors. - Additionally, environmental factors can also play a role in the expression of certain genes related to skin color, further contributing to the variability in skin tones observed in human populations.

In summary, the offspring of a marriage between a person with the genetic makeup AABB and a person with the genetic makeup AaBb would likely exhibit an intermediate skin color due to the combination of dominant and recessive alleles. However, the actual skin color of the offspring can vary, and a range of skin tones may be observed.