Mutations in Chromosome Number

Question 1

Mutations can occur at different levels
Non-disjunction(a pair of homologous chromosomes has failed to separate or segregate which leaves daughter cells with a abnormal amount of chromosomes occurs

Answer 1

occurs when chromosomes fail to separate during meiosis
This occurs spontaneously

Question 2

The gametes may end up with one extra copy of a particular chromosome or no copies of a particular chromosome

These gametes will have a different number of chromosomes compared to the normal haploid number

If the abnormal gametes take part in fertilization, then a chromosome

Answer 2

mutation occurs as the diploid cell will have the incorrect number of chromosomes
Chromosome mutations involve a change in the number of chromosomes