Year 9 Inheritance Flashcards
1
Q
What is an allele?
A
A different form of a gene.
2
Q
How many chromosome pairs are there?
A
23
3
Q
What is a dominant allele?
A
An allele that only needs to be present in one of the two alleles to be expressed.
4
Q
What is a recessive allele?
A
An allele that needs to be present in both alleles to be expressed.
5
Q
What is the name of the name of the square that you use for determining all possible allele pairs?
A
Punnet square
6
Q
What does homozygous mean?
A
Having a pair of the same alleles.
7
Q
What does heterozygous mean?
A
Having two different alleles.
8
Q
What is a genotype?
A
The allele pair e.g. Bb, BB, bb
9
Q
What is a phenotype?
A
The physical/observable trait e.g. brown eyes, blue eyes, green eyes
10
Q
How many chromosomes in a sperm cell?
A
23
11
Q
How many chromosomes in an egg cell?
A
23
