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What is diploid, haploid, chiasma, crossing over, homologous chromosome and tetrad?

Sagot :

diploid cells have 2 sets of chromosomes, or 46 chromosomes. 
haploid cells (such as sex cells) have only 1 set of chromosomes, or 23 chromosomes.
Chiasma-  the point where two homologous non-sister chromatids exchange genetic material during chromosomal crossover during meiosis.
Tetrad- A group of four cells, as of spores or pollen grains, formed from a parent cell by meiosis.