meiosis

Question 1

does meiosis produce diploid gametes?

Answer 1

no, produces haploid gametes

Question 2

when do male and female haploid gametes fuse?

Answer 2

during fertilization - to form a zygote

Question 3

what is the product of meiosis?

Answer 3

haploid gametes

Question 4

what is meiosis also referred to as?

Answer 4

reproductive and reductive division

Question 5

which stage does recombination take place?

Answer 5

prophase I

Question 6

which meiosis stage is most similar to mitosis?

Answer 6

meiosis 2

Question 7

what is crossing over?

Answer 7

formation of chiasmata, then the small sections of chromosomes can be exchanged between non homologous sister chromatids

Question 8

what is bivalent?

Answer 8

pair of homologous chromosomes

Question 9

what allows for greater diversity of genotypes in the population?

Answer 9

recombination and independent assortment

Question 10

which stage dominates meiosis?

Answer 10

prophase I

Question 11

what happens during meiosis I?

Answer 11

maternal and paternal homologues segregate independently and reduce the number of chromosomes to half

Question 12

what happens during meiosis II?

Answer 12

sister chromatids seperate and move to opposite oles

Question 13

what is nondisjunction?

Answer 13

when the seperation of chromosomes is not normal

Question 14

what does nondisjunction result in?

Answer 14

gametes which have either more or less of the usual number of chromosomes - common mechanism of trisomy or monosomy

Question 15

nondisjunction is the cause of several medical conditions in humans including:

Answer 15

down syndrome, klinefelter (xxy) syndrome, turner syndorme and XYY syndrome

Question 16

where is spermatogonia found?

Answer 16

in the outer cortex of the seminiferous tubules of the testicles

Question 17

is all sperm produced functional?

Answer 17

no, sperm are made continously but most are malformed

Question 18

smoking reduces the chances of concieving by …

Answer 18

10 to 40%

Question 19

smoking can age a womans body clock by ….

Answer 19

10 years

Question 20

how does smoking affect males in terms of fertility?

Answer 20

lower sperm count and more malformed sperm than non smokers

Question 21

can genetic defects in sperm affect the children?

Answer 21

yes, genetic defects in sperm accumulate and can be carried over into children.

Question 22

do nicotine patches help with fertility?

Answer 22

no, the effect on fertility is down to nicotine