lecture 6: meiosis and gamete formation

Question 1

how many chromosomes does a human body have

Answer 1

46 (2n)

Question 2

fertilization restores

Answer 2

diploid chromosome number

Question 3

what is the point of meiosis

Answer 3

the produce cells with half the ploidy of the parent cell, so that sexual reproduction can occur

Question 4

meiosis reduces the chromosome number from

Answer 4

diploid (2n) to haploid (n)

Question 5

crossing-over

Answer 5

exchange of corresponding segments of genetic information between non-sister chromatids of homologous chromosomes during synapsis

Question 6

when does crossing over occur

Answer 6

prophase I of meiosis

Question 7

where is the site of crossing over

Answer 7

chiasma

Question 8

when do sister chromatids separate during meiosis

Answer 8

anaphase II

Question 9

meiosis I

Answer 9

separates homologous chromosomes

Question 10

meiosis II

Answer 10

separates sister chromatids

Question 11

how many spermatids are produced from one spermatogonium

Answer 11

4

Question 12

how many ovums are produced from one oogonium

Answer 12

one `

Question 13

a gamete cell has 4 picograms of DNA. How much DNA would be found in a 2n somatic (body) cell from this organism that is in G2?

Answer 13

16 picograms