Question

У батьків хвилясте неруде волосся. Дитина народилася з прямим рудим волоссям. Визначте генотипи батьків і дитини

Answer 1

Батьки гетерозиготгі -- хвилясте волосся: Аа, де хвилясте волосся є рецисивною ознакою; неруде волосся: Вв, де рудий колір є рецисивною ознакою. Дитина є гетерозиготною АаВв, де пряме волосся є домінантною ознакою, а рудий колір -- рецисивною.

Answer 2

The question is about the inheritance of hair texture and color in humans. Hair texture is determined by the shape of the hair follicle, which is influenced by genes. Hair color is determined by the amount and type of melanin, which is also influenced by genes. Both hair texture and color are polygenic traits, meaning that they are controlled by more than one gene and can have multiple alleles.

According to the question, the parents have wavy non-red hair and the child has straight red hair. This means that the parents are heterozygous for both traits, meaning that they have two different alleles for each gene. The child is homozygous recessive for both traits, meaning that they have two copies of the same allele for each gene. The alleles for wavy hair and non-red hair are dominant over the alleles for straight hair and red hair, respectively.

To determine the genotypes of the parents and the child, we can use the following symbols:

- A: allele for wavy hair - a: allele for straight hair - B: allele for non-red hair - b: allele for red hair

The genotypes of the parents are AaBb, meaning that they have one allele for wavy hair and one allele for straight hair, and one allele for non-red hair and one allele for red hair. The genotype of the child is aabb, meaning that they have two alleles for straight hair and two alleles for red hair.

The possible gametes (sex cells) that the parents can produce are AB, Ab, aB, and ab. The possible combinations of gametes that can result in the child's genotype are:

- Ab x ab - aB x ab - ab x Ab - ab x aB

The probability of each combination is 1/4, so the probability of the child having straight red hair is 1/4 x 1/4 = 1/16.

I hope this answer helps you understand the genetics of hair texture and color. If you want to learn more, you can check out these sources:

- [Hair texture] - [Hair color] - [Polygenic traits]