biology topic 3 alleles Flashcards
1
Q
order
A
nucleotide-DNA-chromosome-nucleus
2
Q
what is a nucleotide made of?
A
sugar
phosphate
base
3
Q
what is a DNA made up of?
A
sugar phosphate backbone + double helix
4
Q
what joins two bases?
A
weak hydrogen bond
5
Q
what is a genome?
A
it describes all the genetic information of a single organism
6
Q
genes
A
short section of a DNA that codes for a protein
7
Q
alleles
A
different forms of the gene
8
Q
homozygous
A
two of the same genotypes (2 dominant or 2 recessive)
9
Q
genotype
A
the combination of alleles a gene has
10
Q
phenotype
A
physical characteristics that are observed.
11
Q
zygote
A
the stage of development immediately after fertilisation
