Non-disjunction can occur if __________ chromosomes fail to separate during meiosis I.Question 8Select one:a.homologousb.heterologousc.defectived.mutated

Non-disjunction can occur if homologous chromosomes fail to separate during meiosis I. So, the correct answer is a. homologous.

Here's a step-by-step explanation:

1. Meiosis is a type of cell division that reduces the number of chromosomes in a parent cell by half to produce four gamete cells. This process is what allows for genetic diversity through sexual reproduction.

2. Non-disjunction is an error in meiosis (or mitosis) where chromosomes do not separate properly. This results in cells with an abnormal number of chromosomes, which can lead to genetic disorders.

3. In meiosis I, homologous chromosomes (one from each parent) pair up and should separate so that each daughter cell gets one chromosome from each pair.

4. If these homologous chromosomes fail to separate (non-disjunction), one daughter cell will get both chromosomes and the other will get none. This leads to an abnormal number of chromosomes in the resulting gametes.