In Drosophila crossing over occurs in female but not in male. Gene A a...
Explanation:
Introduction:
Drosophila crossing over occurs in females but not in males. In this process, the exchange of genetic material between homologous chromosomes occurs. The process of crossing over leads to the formation of new combinations of genetic material, which increases the genetic diversity of the offspring.
Given Information:
- Gene A and B are 10 map unit a part on chromosome.
- A female Drosophila with genotype AB/ab.
- A male Drosophila with genotype AB/ab.
Types of Gametes Produced by Female Drosophila:
- The female Drosophila has the genotype AB/ab, which means that she has one chromosome with alleles A and B and another chromosome with alleles a and b.
- As crossing over occurs in females, there is a possibility of the exchange of genetic material between these two chromosomes.
- The distance between genes A and B is 10 map units, which means that the probability of crossing over between these genes is 10%.
- Therefore, the female Drosophila can produce four types of gametes: AB, Ab, aB, and ab.
Types of Gametes Produced by Male Drosophila:
- The male Drosophila also has the genotype AB/ab, which means that he has one chromosome with alleles A and B and another chromosome with alleles a and b.
- As crossing over does not occur in males, there is no possibility of the exchange of genetic material between these two chromosomes.
- Therefore, the male Drosophila can produce only two types of gametes: AB and ab.
Conclusion:
Hence, the correct answer is option 'A', i.e., the female Drosophila can produce four types of gametes, while the male Drosophila can produce only two types of gametes.
In Drosophila crossing over occurs in female but not in male. Gene A a...
Male drosophila will so linkage so only two gametes form...while female form 4 types of gamete ...female gamete can be calculated by fork line method...