Crosses Flashcards
0
Q
What type of parents give a 9:3:3:1 ratio?
A
2 true breeding parents who differ in alleles of two genes
1
Q
What is the F2 ratio for a dihybrid cross?
A
9:3:3:1
2
Q
What does the term recombinant mean?
A
Phenotype different to parents
3
Q
For a backcross, what is the phenotypic ratio?
A
1:1:1:1
4
Q
What two parents are crossed together and it results in a backcross?
A
Double heterozygous and double recessive
5
Q
What is a linked gene and which ratio does it normally lead to?
A
2 genes which are on the same chromosome
1:1 ratio
6
Q
What chromosome in a male carries sex linked genes?
A
X as there is no other alternative gene on the Y chromosome
7
Q
Name sex linked conditions
A
Red-green colourblindness
Haemophilia
