Meiosis

Question 1

what are producing gametes?

Answer 1

sperm and eggs (AKA: germ cells)

Question 2

halpoid

Answer 2

1/2 DNA (germ cells)

23 single chromosomes (22 autosomes, 1 sexome)

Question 3

diploid

Answer 3

full amount of DNA (somatic cells) 46 x-omes)

Question 4

somatic cells

Answer 4

pairs of homologous chromosomes (autosomes) one from each parent

Question 5

homologous chromosomes

Answer 5

diff. versions of gene found on maternal and paternal chromosome

Question 6

sex chromosomes

Answer 6

xx=male

xy=female

Question 7

homologous chromosomes are similar in

Answer 7

length
centromere position
gene laocations (locus)

Question 8

every cell in our body has ____ pairs of x-omes and __ sexome

Answer 8

22 (autosomes)

1

Question 9

genetic recombination

Answer 9

crossong over

Question 10

alleles

Answer 10

same gene, different type

Question 11

M1

Answer 11

homologous chromosomes seperate

reduced by 1/2

Question 12

M2

Answer 12

sister chromatids seperate
chromosome # remains the same
just like mitosis

Question 13

karyotype

Answer 13

produced at metaphase

allow observation of chromosome pairs

Question 14

what does trimsomy 21 cause?

Answer 14

down syndrome

Question 15

most trisomy defects are_____

Answer 15

lethal

Question 16

XXY

Answer 16

klinefelter syndrome

Question 17

XYY

Answer 17

super male

Question 18

XXX

Answer 18

super female

Question 19

XO

Answer 19

turner syndrome

Question 20

males need___ chromosome to survive

Answer 20

x

Question 21

prophase 1

Answer 21

most important stage
-90%
genetic recombination
chiasma=crossing over

Question 22

metaphase 1

Answer 22

homologous pairs line up

Question 23

anaphase 1

Answer 23

pairs seperate

cell becomes halpoid

Question 24

telophase 1

Answer 24

2 halpoid cells

Question 25

is there an interphase between meiosis 1 and meiosis 2

Answer 25

no interphase

same as mitosis

Question 26

prophase 2

Answer 26

• chromosomes condense
• nuclear membrane dissapears
• centrioles move to opp. sides of cell
• spindles start to form

Question 27

metaphase 2

Answer 27

spindle fibers align along equator so that all four chromosomes get cut in half