3.3 Meiosis

Question 1

When does crossing over happen

Answer 1

During prophase I

Question 2

Synapsis

Answer 2

happens during prophase I
Homologous chromosomes pair up to form a bivalent.

Question 3

How are non-sister homologous chromosomes held together during synapsis

Answer 3

Points called chiasmata (chiasma, singular)

Question 4

Chiasmata

Answer 4

Points on non-sister homologous chromosomes which intersect in bivalent during synapsis

Question 5

Effect of chiasmata pairing up

Answer 5

Crossing over of genetic material between non-sister chromatids

Question 6

Exchange of genetic material

Answer 6

Happens during crossing over.
leads to new gene combinations forming on chromatids

Question 6

Process of crossing over

Answer 6

1. Homologous chromosomes align
2. Synapsis occurs, crossover during bivalents at point of chiasma
3. Condense as bivalents and are separated in meiosis

Question 6

Bivalent

Answer 6

a joint pair of homologous chromosomes in synapsis during meiosis

Question 7

Result of crossing over

Answer 7

All four haploid daughter cells with be genetically distinct.
Sister chromatids no longer identical

Question 8

(everything but crossing over)

Answer 8

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Question 9

Homologous chromosomes

Answer 9

2 chromosomes in a pair, 1 from the father, 1 from the mother