MEIOSIS

Question 1

The form of cell division by which gametes, with half the number of chromosomes, are produced.

Answer 1

Meiosis

Question 2

_______ is sexual reproduction.

Answer 2

Meiosis

Question 3

The fusion of a sperm and egg to form a _____?

Answer 3

zygote

Question 4

A zygote is a____?

Answer 4

fertilized egg

Question 5

n=___egg

Answer 5

23

Question 6

2n=____zygote

Answer 6

46

Question 7

Sex cells divide to produce ?

Answer 7

gametes (sperm or egg)

Question 8

Occurs only in gonads (testes or ovaries).

Answer 8

Meiosis

Question 9

for male

Answer 9

spermatogenesis

Question 10

for female

Answer 10

oogenesis

Question 11

Each duplicated chromosome consist of two identical sister chromatids attached at their centromeres.

Answer 11

Interphase I

Question 12

Centriole pairs also replicate.

Answer 12

Interphase I

Question 13

Nucleus and nucleolus visible.

Answer 13

Interphase I

Question 14

how many phases does meiosis I have?

Answer 14

four phases

Question 15

Meiosis I (four phases)

Answer 15

a. prophase I
b. metaphase I
c. anaphase I
d. telophase I

Question 16

Cell division reduces the chromosome number by one-half.

Answer 16

Meiosis I

Question 17

Longest and most complex phase (90%).

Answer 17

Prophase I

Question 18

Chromosomes condense.

Answer 18

Prophase I

Question 19

Synapsis occurs: homologous chromosomes come together to form a tetrad.

Answer 19

Prophase I

Question 20

is two chromosomes or four chromatids (sister and nonsister chromatids).

Answer 20

Tetrad

Question 21

Pair of chromosomes (maternal and paternal) that are similar in shape and size.

Answer 21

Homologous Chromosomes

Question 22

carry genes controlling the same inherited traits.

Answer 22

Homologous pairs (tetrads)

Question 23

Each _____ (position of a gene) is in the same position on homologues.

Answer 23

locus

Question 24

Humans have ___ pairs of homologous chromosomes.

Answer 24

23

Question 25

22 pairs of ?

Answer 25

autosomes

Question 26

01 pair of ?

Answer 26

sex chromosomes

Question 27

A method of organizing the chromosomes of a cell in relation to number, size, and type.

Answer 27

Karyotype

Question 28

21 trisomy

Answer 28

Downs Syndrome

Question 29

If the offspring has two “X” chromosomes it will be a ?

Answer 29

female

Question 30

If the offspring has one “X” chromosome and one “Y” chromosome it will be a ?

Answer 30

male

Question 31

In Humans the “Sex Chromosomes” are the __rd set

Answer 31

23rd

Question 32

may occur between nonsister chromatids at the chiasmata.

Answer 32

Crossing over (variation)

Question 33

segments of nonsister chromatids break and reattach to the other chromatid.

Answer 33

Crossing over

Question 34

are the sites of crossing over.

Answer 34

Chiasmata (chiasma)

Question 35

Shortest phase

Answer 35

Metaphase I

Question 36

align on the metaphase plate.

Answer 36

Tetrads

Question 37

In terms of Independent Assortment -how many different combinations of sperm could a human male produce?

Answer 37

Formula: 2n Human chromosomes: 2n = 46 n = 23 223 = ~8 million combinations

Question 38

Homologous chromosomes separate and move towards the poles.

Answer 38

Anaphase I

Question 39

Sister chromatids remain attached at their centromeres.

Answer 39

Anaphase I

Question 40

Each pole now has haploid set of chromosomes.

Answer 40

Telophase I

Question 41

Cytokinesis occurs and two haploid daughter cells are formed.

Answer 41

Telophase I

Question 42

No interphase II (or very short - no more DNA replication)

Answer 42

Meiosis II

Question 43

same as prophase in mitosis

Answer 43

Prophase II

Question 44

same as metaphase in mitosis

Answer 44

Metaphase II

Question 45

same as anaphase in mitosis

Answer 45

Anaphase II

Question 46

sister chromatids separate

Answer 46

Anaphase II

Question 47

Same as telophase in mitosis.

Answer 47

Telophase II

Question 48

Nuclei form.

Answer 48

Telophase II

Question 49

Cytokinesis occurs.

Answer 49

Telophase II

Question 50

four haploid daughter cells produced.

Answer 50

Telophase II

Question 51

gametes =

Answer 51

sperm or egg

Question 52

Important to population as the raw material for natural selection.

Answer 52

Variation

Question 53

What are the three sexual sources of genetic variation?

Answer 53

1. crossing over (prophase I) 2. independent assortment (metaphase I) 3. random fertilization

Question 54

In Humans the “Autosomes” are sets ?

Answer 54

1-22

Question 55

Tetrads align on the metaphase plate

Answer 55

metaphase I

Question 56

Four hapliod daugther cells produced

Answer 56

telophase II