Which of the following does a defect occur in chromosomes? a. phosphase 2 b. anaphrase 1 c, metaphase 2

From the given choices, the most appropriate answer would be B. Anaphrase 1.

Anaphase I is the stage of meiosis I in which homologous chromosomes are pulled towards opposite poles with the help of spindle fibers.

The chromosomal defect which can occur in this stage is "unequal distribution of chromosomes in two daughter cells".

It may occur when the spindle fiber fails to attach to a particular chromosome.

It leads to the production of daughter cell or gamete with extra or decreased number of chromosomes.

When these types of gametes fertilize with other gametes, it may result in aneuploidy in the resulting offspring.

g1

choices:

a. g2. b. g1. c. m

cell division has two checkpoints namely, g1

checkpoint and spindle assembly checkpoint. the checkpoint which determines if

division has properly occurred is the g1 checkpoint. at this point, is a damage

in the dna is detected or  the has not reach the optimum size, the cell is

stopped in g1 and is not allowed to proceed to further process.

source:

b is the correct answer