Question

The occurrence of tetratype in the acetomycete fungi is possible only if the crossing over occurred during the
A) Four-strand stage

C) Two-strand stage

B) G1 phase

D) S phase​

Answer 1

Four strand stage (A)

Explanation:

• Crossing over is the process where genetic information is shared between the non-sister chromatids of two homologous chromosomes.
• It results in the formation of tetra type or recombinants.
• This happens during the pachytene phase when the four strands of chromosomes align in a manner to favor crossing over of genetic material.
• Tetratype is a tetrad containing four different genotypes, two parental and two recombinant.  There are 2 parental and 2 recombinant spore is the spore arrangement in Ascomycetes.
• Therefore four strand stage (A) is the correct option.