Meiosis And Genetic Variation

Question 1

How many daughter cells does meiosis produce?

Answer 1

4 (each with half the number of chromosomes as the parent cell)

Question 2

What is the diploid number of chromosomes in humans?

Answer 2

46

Question 3

How many complete sets of chromosomes do diploid cells have?

Answer 3

Two, one set provided by each parent

Question 4

What happens in meiosis 1?

Answer 4

Homologous chromosomes pair up and their chromatids wrap around each other. Portions are exchanged through crossing over

Question 5

What happens in meiosis 2?

Answer 5

The chromatids move apart and four cells have been formed by the end

Question 6

Define gene

Answer 6

A length of DNA that codes for a polypeptide

Question 7

Define locus

Answer 7

The position of a gene on a chromosome or DNA molecule

Question 8

Define allele

Answer 8

One of the different forms of a particular gene

Question 9

Define homologous chromosomes

Answer 9

A pair of chromosomes, one maternal & one paternal, that have the same gene loci

Question 10

What do alleles control?

Answer 10

Characteristics

Question 11

In crossing over, what is the genetic composition of the four cells?

Answer 11

Each have a different genetic composition

Question 12

What is the formula for combinations following meiosis?

Answer 12

2(n) where n= the number of pairs of homologous chromosomes

Question 13

What is the formula for the combination of gametes?

Answer 13

(2n)2 where n = the number of pairs of homologous chromosomes