Question

What would be segregation pattern of ascospores in Neurospora asci in case of 'crossing over' of the type given below?

• A. ab, ab, ab, ab, AB, AB, AB, AB
• B. Ab, Ab, Ab, Ab, aB, aB, aB, aB
• C. aB, aB, ab, ab, AB, AB, Ab, Ab
• D. None of these

Answer 1

The correct option is A ab, ab, ab, ab, AB, AB, AB, AB

A pattern of ascospore genotype for a gene pair showing two alleles segregate into different nuclei only at the second meiotic division as a result of a single crossover between that gene pair and its centromere.

So, the correct option is 'ab, ab, ab, ab, AB, AB, AB, AB'