science
Grade-10
Easy
Question
What structures exchange genetic material during crossing over?
Non-sister chromatids
Non-homologous chromosomes
Sister chromatids
Egg and the sperm
Non-sister chromatids
Non-homologous chromosomes
Sister chromatids
Egg and the sperm
Hint:
The chromosomes which have different alleles but the same genes exchange genetic material.
The correct answer is: Non-sister chromatids
- Recombination is the exchange of genetic material between homologous chromosomes. Homologous chromosomes come together to form tetrads.
- This close contact allows the non-sister chromatids of homologous chromosomes to bind to each other and exchange nucleotide sequences.
- Each chromosome has a homologous pair, one from the mother (maternal) and one from the father (paternal).
- These homologous pairs contain the same gene but may contain different alleles and are not exact copies of each other and are called non-sisters. chromatids.
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