Meiosis

Question 1

What is asexual reproduction

Answer 1

produces 2 genetically identical offspring
only needs one parent
ex. bacteria

Question 2

What is sexual production

Answer 2

involves 2 parents
leads to genetically distinct offspring

Question 3

What is a diploid cell

Answer 3

somatic cell
has 2n (23 pairs of chromosomes)
skin, blood, gut, heart

Question 4

What is a gamete

Answer 4

reproductive cell
haploid
n
has one copy of the chromosomes

Question 5

which reproduction halves ploidy

Answer 5

meiosis
2n->n
makes 2 different daughter cells

Question 6

What are the 3 main steps in meiosis and what happens

Answer 6

Interphase - DNA is replicated
Meiosis I Reduction - converts 1 diploid cell (2n) into 2 haploid cells (n)
Meiosis II Division - separates the contents of the 2 haploid cells into 4 haploid gametes

Question 7

How many chromosomes after meiosis I it starts with 46

Answer 7

23 after meiosis I

Question 8

If a cell has 6 chromosomes and 6 DNA molecules at the beginning of meiosis how many does it have at the end of replication (meiosis I)

Answer 8

It will have 6 chromosomes but 12 DNA molecules

Question 9

What is crossing over when does it happen

Answer 9

only happens in prophase I
leads to non identical sister chromatids

Question 10

When does DNA replicate and interphase happen in meiosis

Answer 10

only happens once in meiosis I in the beginning

Question 11

What is the law of segregation

Answer 11

only one chromosome from each homologous pair will be found in each daughter cell

Question 12

When do chromosomes form tetrads

Answer 12

prophase I of meiosis I