Question

Чоловік, який має короткі вії, одружився з жінкою, яка має довг вії. У них народилася дитина з довгими віями. Відомо, що ця ознака зчеплена з Х-хромосомою, довгi вiï - ознака домінантна, а короткі - рецесивна. Визначте генотипи батьків дитини. Якої статі дитина?​

Answer 1

Відповідь: ХХ ×ХУ

P: (мама) AA × Аа (батько), оскільки довгії вії зчеплені з Х хромосомою:

F: АА, дівчинка

Answer 2

The Genotypes of the Parents and the Sex of the Child

To determine the genotypes of the parents and the sex of the child, we need to consider the information provided in the question.

1. The husband has short eyelashes, which is a recessive trait. 2. The wife has long eyelashes, which is a dominant trait. 3. The child has long eyelashes.

Based on this information, we can make the following assumptions:

- The husband's genotype for eyelash length is ss (homozygous recessive). - The wife's genotype for eyelash length is LL (homozygous dominant). - The child's genotype for eyelash length is Ls (heterozygous dominant).

Since the trait for long eyelashes is dominant, the child inherited one long eyelash allele from the mother (L) and one short eyelash allele from the father (s). Therefore, the child is heterozygous for eyelash length.

Now, let's determine the sex of the child. The question does not provide any information about the sex chromosomes, so we cannot determine the sex of the child based solely on the given information. The sex of the child would depend on the combination of sex chromosomes inherited from the parents. Typically, males have one X and one Y chromosome (XY), while females have two X chromosomes (XX).

To determine the sex of the child, we would need additional information about the sex chromosomes.