What are chromosomes. Explain how in sexually reproducing organisms the no of chromosomes in the progeny is maintained?
Answers
Answer:
DNA containing genes wrapped around the histone proteins to form nucleosomes.
nucleosomes seems like beads on string...
This string condensed as much as possible and forms a compact structures called chromosomes...
If sexually reproducing organisms are diploid, gametes are formed by meiosis, form haploid male and female gametes containing n chromosomes in each...
when both gametes fuse together, they form diploid zygote containing 2n chromosome which developes into new individual...
If sexually reproducing organisms are haploid, gametes are formed by mitosis, form haploid male and female gametes containing n chromosomes each...
when both gametes fused together, forms diploid zygote containing 2n chromosomes...
zygote undergo zygotic meiosis to form haploid (n) spores which on germination forms haploid individuals...
In this way chromosome number in progeny is maintained in sexually reproducing organisms...
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