Meiosis and Sexual Reproduction

Question 1

checkpoint

Answer 1

can block progression through cell cycle if not met

Question 2

cyclin

Answer 2

made constantly when out of mitosis but when the cell enters mitosis it disappears; when a threshold for enough cyclin is reached mitosis begins

Question 3

cyclin dependent kinase

Answer 3

binds to cyclin to create active MPF which is necessary for mitosis

Question 4

transformation

Answer 4

specialized channels take DNA from outside which then gets incorporated into chromosomes

Question 5

pili

Answer 5

long extensions of membrane in bacteria

Question 6

plasmid

Answer 6

parts of chromosomes passed on during transformation

Question 7

homologous chromosomes

Answer 7

not identical, each is inherited during fertilization from a different haploid gamete; have same genes in same regions but can have dif alleles

Question 8

haploid (1n)

Answer 8

cells only have one of each homolog

Question 9

diploid (2n)

Answer 9

cells have pairs of homologous chromosomes

Question 10

gamete

Answer 10

haploid cells that are passed on (egg, sperm)

Question 11

zygote

Answer 11

haploid cells after fertilization (now diploid)