Question

Неповне домінування У каракулевих овець домінантний ген в гетерозиготному стані обумовлює сіре забарвлення хутра, а в гомозиготному летальний. Рецесивний алель цього гену обумовлює чорне забарвлення хутра. Сірі вівці були схрещені з сірими баранами в результаті отримали 60 живих ягнят. 1. Скільки типів гамет може утворити сірий баран? 2. Скільки живих ягнят можуть мати сіре забарвлення хутра? 3. Скільки може бути отримано чорних ягнят? 4. Скільки може бути живих гомозиготних ягнят ? 5. Скільки буде мертвих ягнят?

Answer 1

Incomplete Dominance in Karakul Sheep

In Karakul sheep, the dominant gene in the heterozygous state determines gray fur color, while in the homozygous state, it is lethal. The recessive allele of this gene determines black fur color. When gray sheep are crossed with gray rams, 60 live lambs are obtained.

1. How many types of gametes can a gray ram produce? - In this case, the gray ram is heterozygous for the fur color gene. Since there are two alleles (dominant gray and recessive black), it can produce two types of gametes: one carrying the gray allele and the other carrying the black allele.

2. How many live lambs can have gray fur color? - Since gray fur color is determined by the dominant allele, any lamb that inherits at least one gray allele will have gray fur color. In this case, 60 live lambs were obtained, so all of them can have gray fur color.

3. How many black lambs can be obtained? - Black fur color is determined by the recessive allele. To determine the number of black lambs, we need to know the genotypes of the parents. However, the information provided does not specify the genotypes of the gray sheep and rams. Therefore, we cannot determine the exact number of black lambs.

4. How many live homozygous lambs can be obtained? - Homozygous lambs for the gray fur color gene are lethal, so no live homozygous lambs can be obtained.

5. How many lambs will be stillborn? - The information provided does not specify the number of stillborn lambs. Therefore, we cannot determine the exact number of stillborn lambs.

Please note that the information provided is based on the concept of incomplete dominance in Karakul sheep. If there are additional factors or genetic interactions involved, the results may vary.