Lecture 9- Numerical and structural abnormalities

Question 1

Alternate segregation of a translocation

Answer 1

1’s segregate together and 2’s segregate together to give rise to balanced gametes. There is no rearrangement or balanced translocation.

Kids would be normal like their parents

This happens 2/3 of the time

Question 2

Adjacent 1 segregation

Answer 2

The top and bottom chromosomes on the cross segregate together resulting in unbalanced gametes with duplication and deletion of gene regions

Question 3

Adjacent 2 segregation

Answer 3

Homologous centromeres move to the same poles (rare) gives unbalanced gametes

Question 4

3:1 segregation

Answer 4

Three chromosomes end up in one gamete and 1 in the other. Unlikely to be viable.