Question

У плодовой мухи дрозофилы белый цвет глаз наследуется как рецессивный признак, красный - как доминантный. Гены, определяющие цвет глаз, сцеплены с Х-хромосомой. Определите, какова вероятность получения белоглазово потомства, если: 1) скрестить белоглазую самку с красноглазым самцом. 2)скрестить между собой гибридов первого поколения?

Answer 1

1-25 процентов.
2-75 процентов.
Прости насколько правильность не знаю, но вроде вычислила как учили)

Answer 2

Inheritance of Eye Color in Drosophila Fruit Flies

In Drosophila fruit flies, the white eye color is inherited as a recessive trait, while the red eye color is inherited as a dominant trait. The genes that determine eye color are linked to the X-chromosome. Let's calculate the probabilities of obtaining white-eyed offspring in two different scenarios:

1) Cross between a white-eyed female and a red-eyed male:

When a white-eyed female (homozygous recessive) is crossed with a red-eyed male (homozygous dominant), the genotype of the female is ww and the genotype of the male is WY. The W allele represents the dominant red eye color gene, and the w allele represents the recessive white eye color gene.

The possible genotypes of the offspring are: - 100% of the offspring will be heterozygous for eye color (Ww) and have red eyes.

Therefore, the probability of obtaining white-eyed offspring in this cross is 0%.

2) Cross between hybrids of the first generation:

When the heterozygous offspring (Ww) from the first cross are crossed with each other, the possible genotypes of the offspring are: - 25% will be homozygous dominant (WW) and have red eyes. - 50% will be heterozygous (Ww) and have red eyes. - 25% will be homozygous recessive (ww) and have white eyes.

Therefore, the probability of obtaining white-eyed offspring in this cross is 25%.

Please note that these probabilities are based on the assumption that eye color in Drosophila fruit flies is solely determined by the genes linked to the X-chromosome and that there are no other factors influencing eye color inheritance.

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