Question

у человека ген длинных ресниц доминирует над геном коротких женщина с длинными ресницами вышла замуж за мужчину с короткими ресницами.составьте схему решения задачи, определите генотипы родителей ,фенотипы ,генотипы возможного потомства

Answer 1

Если преположить что женщина была гомозиготной по данному признаку, то:
Р: женщина АА×мужчина аа
G: A a
F1:Aa-100% по генотипу и фенотипу (гетерозиг.и длин.ресницы)
Если предположить что женщина гетерозиготна, то:
Р; женщина Аа×мужчина аа
G:A a a
F1:Aa- 50% по генотипу и фенотипу
аа-50% короткие ресницы гомозиг.

Answer 2

Problem Analysis

To solve this problem, we need to determine the genotypes, phenotypes, and possible genotypes of the offspring based on the dominance of the gene for long eyelashes over the gene for short eyelashes. We are given that a woman with long eyelashes marries a man with short eyelashes.

Solution

1. Let's assign the dominant gene for long eyelashes as "L" and the recessive gene for short eyelashes as "l". 2. The woman's genotype is LL (homozygous dominant) because she has long eyelashes. 3. The man's genotype is ll (homozygous recessive) because he has short eyelashes. 4. We can use a Punnett square to determine the possible genotypes and phenotypes of the offspring.

| | L | L | |----------|-----------|-----------| | l | Ll | Ll | | l | Ll | Ll |

5. From the Punnett square, we can see that all the offspring will have the genotype Ll (heterozygous) for eyelash length. 6. The phenotype of the offspring will be long eyelashes because the dominant gene for long eyelashes (L) is present.

Conclusion

Based on the given information, the genotypes of the parents are LL (woman) and ll (man), and the genotypes of the possible offspring are Ll. The phenotype of all the offspring will be long eyelashes.

Please note that the provided search results did not contain specific information about the inheritance of eyelash length. However, the solution provided is based on the assumption that eyelash length is determined by a single gene with complete dominance.