Biology
The basis of genetic variation in the living organisms during mitosis occurs due to :
- Cell division
- Mutation
- Crossing over
- Karyokinesis
Cell Division
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Answer
Crossing over
Reason — Crossing over results in change of gene sequence which is responsible for variation.
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Related Questions
Nitrogenous bases are important components of DNA. They are formed by the combination of purines and pyrimidines with the help of hydrogen bonds. Which of the following options shows an incorrect combination ?
- Adenine = Thymine
- Guanine ≡ Cytosine
- Cytosine ≡ Guanine
- Thymine = Cytosine
In the cells of a human male body, the number of autosomes is :
- 23 pairs
- 22 pairs
- 1 pair
- 46 pairs
After a mitotic cell division, a human female cell will have :
- 22 + X chromosomes
- 44 + XY chromosomes
- 44 + XX chromosomes
- 22 + XX chromosomes
The phase of karyokinesis which is almost the reverse of prophase is :
- Interphase
- Metaphase
- Anaphase
- Telophase