Question

Only ______ segregation produces viable gametes and progeny, which also occurs in about half of meiosis and accounts for semi-sterility of translocation heterozygotes.
a. Alternate
b. Adjacent-1
c. Adjacent-2
d. Both B & C

Answer 1

Answer:

a. Alternate

Explanation:

Translocation is the process whereby two non-homologous chromosomes undergo mutation by exchanging their parts. This establishes new linkages in the chromosomes. Translocations occur during anaphase I of meiosis. There are two common types of segregations that occur during translocations; Adjacent-1 and Alternate segregations which both have equal chances of occurrence. A less common third one is Adjacent-2 segregation.

Adjacent-1 and Adjacent-2 segregation produces genetically incomplete gametes, therefore, the gametes are non-viable or sterile.

Alternate segregation on the other hand result in the formation of genetically complete gametes, therefore, the gametes produced are viable.

Only alternate segregation produces viable gametes and progeny, which also occurs in about half of meiosis and accounts for semi-sterility of translocation heterozygotes.