Question

У шершуль длинный яйцеклад наследуется как рецессивный аутосомный признак, а наличие двух ноздрей на хвосте — как рецессивный, сцепленный с Х-хромосомой признак (одна ноздря на хвосте — доминантный признак). Самцы шер - шуль гетерогаметны. Определите генотипы родителей, ге нотипы и фенотипы потомков от скрещивания гетерози готного с коротким яйцекладом и двумя ноздрями на хвосте самца с дигетерозиготной самкой, имеющей короткий яй цеклад и одну ноздрю на хвосте. Составьте схему решения задачи. Какова вероятность появления самца шершули с длинным яйцекладом и одной ноздрёй на хвосте?

Answer 1

Это решение я сама поняла,но нам объяснили именно так

Answer 2

Background Information

The question is asking about the inheritance patterns of two traits in a species of wasp called the "шершуль" (shershul). The traits in question are the length of the ovipositor (egg-laying organ) and the number of nostrils on the tail. The length of the ovipositor is inherited as a recessive autosomal trait, while the presence of two nostrils on the tail is inherited as a recessive trait linked to the X chromosome. Male shershul wasps are heterogametic.

Genotypes and Phenotypes

To determine the genotypes and phenotypes of the parents and offspring, we need to consider the inheritance patterns of the two traits.

1. Length of the Ovipositor: - Long ovipositor (dominant phenotype): L - Short ovipositor (recessive phenotype): l

2. Number of Nostrils on the Tail: - Two nostrils (recessive phenotype): N - One nostril (dominant phenotype): n

Based on the information provided, we have the following individuals:

- Male with heterozygous genotype for both traits: LlNn - Female with homozygous recessive genotype for both traits: llnn

Punnett Square and Offspring Genotypes

To determine the genotypes and phenotypes of the offspring, we can use a Punnett square. Let's consider the two traits separately:

1. Length of the Ovipositor: - Male genotype: Ll - Female genotype: ll - Possible offspring genotypes: Ll (long ovipositor) and ll (short ovipositor)

2. Number of Nostrils on the Tail: - Male genotype: Nn - Female genotype: nn - Possible offspring genotypes: Nn (two nostrils) and nn (one nostril)

Combining the genotypes for both traits, we can determine the possible genotypes and phenotypes of the offspring:

- LlNn: Long ovipositor, two nostrils - Llnn: Long ovipositor, one nostril - llNn: Short ovipositor, two nostrils - llnn: Short ovipositor, one nostril

Probability of a Male Shershul with Long Ovipositor and One Nostril

To calculate the probability of a male shershul with a long ovipositor and one nostril, we need to consider the genotypes of the offspring.

From the Punnett square, we can see that there are two possible genotypes that can result in a male shershul with a long ovipositor and one nostril: Llnn and llnn.

The probability of each genotype depends on the probability of each allele combination during gamete formation and fertilization. Assuming independent assortment and random mating, the probability of each genotype can be calculated by multiplying the probabilities of the individual alleles.

Let's assume that the probability of each allele is 0.5 (50% chance for each allele to be passed on). Using this assumption, we can calculate the probabilities as follows:

- Probability of Llnn: 0.5 (probability of inheriting the long ovipositor allele) * 0.5 (probability of inheriting the one nostril allele) = 0.25 or 25% - Probability of llnn: 0.5 (probability of inheriting the short ovipositor allele) * 0.5 (probability of inheriting the one nostril allele) = 0.25 or 25%

Therefore, the combined probability of a male shershul with a long ovipositor and one nostril is 25% + 25% = 50%.

Conclusion

In summary, the genotypes and phenotypes of the parents and offspring can be determined based on the inheritance patterns of the two traits in the shershul wasp. The Punnett square analysis shows that there are four possible genotypes for the offspring, resulting in different combinations of ovipositor length and number of nostrils. The probability of a male shershul with a long ovipositor and one nostril is 50%.

Please note that the probabilities provided are based on the assumption of independent assortment and random mating, and actual probabilities may vary in real populations.