meiosis and genetic variation 2

Question 1

during meiosis 1 what do homologous pairs of chromosomes do

Answer 1

during meiosis 1 , homologous pairs of chromosomes come together and pair up the chromatids swap over. The chromatids still contain the same genes but now have a different combination of alleles

Question 2

what are the two main events during meiosis that lead to genetic variation

Answer 2

crossing over of chromatids, independent segregation of chromosomes

Question 3

are cells produced in meiosis genetically the same

Answer 3

no, they are genetically different

Question 4

what does the crossing over of chromatids during meiosis 1 mean

Answer 4

the crossing over of chromatids in meiosis 1 means tha each of the four daughter cells formed from meiosis contain chromatids with different alleles

Question 5

what happens in meiosis 1

Answer 5

the chromosomes of homologous pairs come together

chromatids cross over

one chromosome from each homologous pair ends up in each cell

Question 6

what happens in meiosis 2

Answer 6

each cell has a different chromatid and therefore a different set of alleles, which increases genetic variation

Question 7

what are all the outcomes of mitosis

Answer 7

produces cells with the same number of chromososmes as the parent cell

daughter cells are genetically identical to eachother and to the parent cell

produces two daughter cells

Question 8

what are all the outcomes of meiosis

Answer 8

produces cells with half the number of chromosomes as the parent cell

daughter cells are genetically identical from one another and the parent cell

produces four daughter cells