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- #Biology
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- #Genetics and Evolution
- #Class 12
When F1 female Drosophila of the genotype a+ a b+ b c+ c is test crossed, the following progenies were obtained:
| Progeny classes | Number of progenies |
| a+ b+ c+ | 22 |
| a+ b+ c | 28 |
| a b c+ | 26 |
| a b c | 24 |
| a+ b c+ | 230 |
| a+ b c | 220 |
| a b+ c+ | 225 |
| a b+ c | 225 |
| Total | 1000 |
The progeny has been shown as classes derived from the female gamete.
Statements 1 to 6 as given below are conclusions derived from the above result
1. Genes a and b are linked in cis.
2. Genes a and b are linked in trans.
3. Genes a and b are linked in cis while b and c are linked in trans.
4. The genotypes of the parents are a+ a+ b+ b+ and aabb.
5. The genotypes of the parents are a+ a+ bb and aab+ b+.
6. genes a and b are 10 cM apart.
Which of the above statements are correct?
3 alone
1, 5 and 6
2, 5 and 6
1, 4 and 6
Answers (1)
Genes a and b are linked in trans and the genotypes of the parents are a+ a+ bb and aab+b+. Genes a and b are 10 cM apart. Therefore, three statements are correct.
Hence, the correct answer is option 3.
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