Unit 5: Heredity

Question 1

Difference between diploid and haploid

Answer 1

2n: 2 sets of homologous chromosomes (maternal + paternal)
vs
n: only 1 set of chromosomes (gametes = sperm + egg cells)

Question 2

What is the end product of meiosis?

Answer 2

4 daughter cells, each with half as many as the parent cell

Question 3

what is meiosis?

Answer 3

cell division that reduces the # of chromosomes, creates gametes

Question 4

What events are unique to meiosis I

Answer 4

Prophase I: synapsis and crossing over
Metaphase I: Pairs of homologous chromosomes line up on equator
Anaphase I: Pairs of homologous chromosomes split, centromeres are still attatched

Question 5

What is the only difference between Meiosis II and Mitosis?

Answer 5

end product is 4 (1/2)n cells vs 2 n cells

Question 6

WAHT ARE THE 3 SOURCES OF GENETIC VARIATION

Answer 6

Crossing Over
Independent Assortment of Chromosomes (random orientation of chromosomes along equator)
Random Fertization (any sperm + any egg)

Question 7

why is testcrossing important

Answer 7

Helps determine if the dominant trait is homozygous or heterozygous by crossing Dominant and recessive phenotypes

Question 8

Incomplete dominance when crossing a Red X White results in

Answer 8

Pink flower

Question 9

Codominance when crossing a Red X White results in

Answer 9

red and white - both products are equally expressed