chromosome, chromosome abnormalities and birth defects

Question 1

meisosis stages

Answer 1

prophase I, metaphase I, anaphase I, telophase I, prophase II, metaphase II, anaphase II, telophase II

Question 2

3 types of non-disjunction and result

Answer 2

failure of a pair of homologous chromosomes to separate in meiosis I; failure of sister chromatids to separate during meiosis II; failure of sister chromatids to separate during mitosis; results in aneuploidy

Question 3

recombination: definition and stage

Answer 3

process where homologous chromosomes are broken at the same place and rejoined to give new combinations of alleles; occurs in prophase I

Question 4

number of chromosomes and chromatids in prophase

Answer 4

92 chromatids, 46 chromosomes