chromosome basis of variation Flashcards
1
Q
how many DNA molecules are contained in a chromosome?
A
2- one per chromatid
2
Q
define genome
A
the complete set of genetic material in a haploid set of chromosomes
3
Q
what is the DNA content of cells before DNA replication, during S phase and after mitotic division?
A
2C -> 4C -> 2C
4
Q
how is the DNA wrapped around the histones in the nucleosome?
A
147 bp in 1.67 left-handed superhelical turns
5
Q
what occurs during G1?
A
cellular contents duplicated
6
Q
what occurs during S phase?
A
chromosomes duplicated
7
Q
what occurs during G2?
A
cell checks duplicated chromosomes for errors
