Question

Срочно!!! Даю 50 баллов!!! У человека некоторые формы близорукости доминируют над нормальным зрением, карий цвет глаз — над голубым. Определи вероятность появления в потомстве близоруких детей с карими глазами, если оба родителя гетерозиготны по обоим признакам.

Answer 1

Ответ:

Близорукость - А

норма - а

Карие глаза - В

Голубые - в

Объяснение:

P: АаВв х АаВв

G: АВ Ав аВ ав х АВ Ав аВ ав

F1:  АВ        Ав          аВ            ав

АВ ААВВ   ААВв      АаВВ       АаВв

Ав ААВв    ААвв      АаВв       Аавв

аВ АаВВ     АаВв      ааВВ       аавв

ав АаВв     Аавв       ааВв        аавв

Вероятность близоруких с карими глазами = 9/16 = 56,25%

Answer 2

Probability of Offspring with Myopia and Brown Eyes

To determine the probability of having offspring with myopia (nearsightedness) and brown eyes, given that both parents are heterozygous for both traits, we need to consider the inheritance patterns of these traits.

1. Inheritance of Myopia: - Myopia is a complex trait influenced by both genetic and environmental factors. - It is believed to be polygenic, meaning that multiple genes contribute to its development. - The exact inheritance pattern of myopia is not fully understood, but it is likely influenced by the interaction of multiple genes and environmental factors.

2. Inheritance of Eye Color: - Eye color is determined by the interaction of multiple genes, with the OCA2 gene playing a significant role. - The OCA2 gene has two common variants: a brown allele (B) and a blue allele (b). - Brown eye color is dominant over blue eye color, so individuals with at least one brown allele will have brown eyes.

Given that both parents are heterozygous for both myopia and eye color, we can use Punnett squares to determine the probability of different combinations of alleles in their offspring.

Punnett Square for Myopia and Eye Color:

| | B | b | |----------|-------|-------| | B | BB | Bb | | b | Bb | bb |

In the Punnett square above, the letters B and b represent the alleles for eye color, and the letters M and m represent the alleles for myopia.

From the Punnett square, we can see that there are four possible combinations of alleles in the offspring:

1. BBMM: Offspring with normal vision and brown eyes. 2. BbMM: Offspring with myopia and brown eyes. 3. BBMm: Offspring with normal vision and brown eyes. 4. BbMm: Offspring with myopia and brown eyes.

To calculate the probability of having offspring with myopia and brown eyes, we need to determine the proportion of offspring with the BbMm genotype out of all possible genotypes.

Since both parents are heterozygous for both traits, the probability of each parent passing on the BbMm genotype to their offspring is 1/4.

Therefore, the probability of having offspring with myopia and brown eyes, given that both parents are heterozygous for both traits, is 1/4.

Please note that this calculation assumes simple Mendelian inheritance patterns and does not take into account other potential genetic or environmental factors that may influence the development of myopia or eye color.