nucleus and chromosomes Flashcards
1
Q
what happens in the nucleus of a cell?
A
the DNA double helix supercoils to form structures called chromosomes
2
Q
when are chromosomes visible?
A
during cell division
3
Q
how many pairs of chromosomes do ordinary human body cells contain?
A
23
4
Q
what is a diploid number?
A
23 pairs of chromsomes
5
Q
what are the 23rd pair of chromosomes?
A
the sex chromosomes
6
Q
what are the sex chromosomes in a female like?
A
the same- XX (homozygous)
7
Q
what are the sex chromosomes in a male like?
A
different- XY (heterozygous).
8
Q
how many chromosomes do gametes contain?
A
23 individual
9
Q
what is haploid?
A
half the number of chromosomes- 23 chromosomes
10
Q
where are genes found?
A
on chromosomes
