Question

Crossing over that results in genetic recombination in higher organisms occurs between
(1) Non sister chromatids of a bivalent
(2) Two daughter nuclei
(3) Two different bivalent
(4) Sister chromatids of a bivalent

Answer 1

1 ie Non sister chromatids of bivalent cause they both have different genetic materials which helps in recombination and later variations
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Answer 2

ANSWER 1 is correct.

crossing over that result in genetic recombination in higher organisms occurs between non sister chromatids of bivalent , it is a single crossing over.
Defination - one only chiasma is formed between two non sister chromatids of bivalent ss a result o which two non cross over type and two single cross over type of chromatids are formed.

CROSSING OVER

Complete linkage is very rarely found in nature.

Defination - the exchange of segments between non sister chromatids of homologous chromosomes is called crossing over.
MECHANISM OF CROSSING OVER - the process complete in following four steps.

1. Synapsis

2. Duplication of chromosomes

3. Crossing over and chiasma formation.

4. Terminalization

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