Meiosis

Question 1

Chromosomal Abnormalities are

Answer 1

The leading cause of miscarriage

Question 2

Chromosomal index

Answer 2

P-arm/ length of chromosome

Question 3

Meiosis 1

Answer 3

Basically normal cell replication from one cell into two cells

Question 4

Meiosis 2

Answer 4

2 cells go from diploid to 4 haploid as they do not replicate DNA before splitting

Question 5

Nondisjunction of meiosis 1

Answer 5

Creates a trisomic cell and a monosomic cell (IN EGG)

Leads to 2 disomic gametes and 2 monosomic gametes

Monosomy is only viable on chromosome X

Question 6

Nondisjunction meiosis 2

Answer 6

Creates 1 disomic gamete and 1 nullisomic gamete

Usually happens in SPERM, nd during meiosis 1 happens in EGG

Question 7

Meiosis in males

Answer 7

1 cell to 4 spermatids

Question 8

Meiosis 1 in females

Answer 8

Begins and ends before birth

Only 20% of original oova survive

Completed with extrusion of 1st polar body (diploid)

Question 9

Meiosis 2 in females

Answer 9

Completion happens with exclusion of 2nd polar body(haploid)

One sister chromatid remains in the egg cell

Question 10

Did nondisjunction occur in M1 or M2?

Answer 10

Look at the centromeres

Heterozygous means M1

Homozygous means M2