8.2 DNA and the chromosomes Flashcards
1
Q
what’s an allele?
A
an alternative form of a gene that occurs at the same locus on homologous chromosomes
2
Q
what are homologous chromosomes?
A
pair of matching chromosomes that carry the same genes at the same locus
3
Q
what are chromosomes joined at?
A
centromere
4
Q
what is a single chromosome thread called?
A
chromatid
5
Q
what are DNA in chromosomes held by?
A
histones
6
Q
what’s DNA’s structure?
A
Double helix
7
Q
what is a mutation?
A
any changes in the base sequence of a gene produces a new allele of that gene
