BIOL207 Chapter Notes - Chapter 15 & 17: Autosome, Karyotype, Dna Replication
18 Nov 2016
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The number of chromosomes in the gamete is known as the n-value. The number of chromosomes however, does not change with dna replication. Remember within each nucleus are 23 pairs of chromosomes, half from the mother and half from the father. The amount of dna content in a gamete is known as the c-value. When an egg and sperm join the zygote is 2c=6000mb. Before the zygote can divide it must replicate the dna 4c=12000 mb. Each of those divided cells replicate back to 4c. Each of those divide once again and return to 2c. When the sperm (1n) fertilizes the egg (1n) we get a zygote that is 2n=46. replicated chromosome is still just one chromosome. in the number, shape or size of chromosomes. Autosomal chromosomes: 22 chromosomes unrelated to the set of the individual. Sex chromosomes: chromosomes that differentiate the gender of the individual. Sex determination is done by the sex chromosomes.
