Chromosomes and Mendel Flashcards
1
Q
Is haemophilia dominant or recessive?
A
Recessive
2
Q
What is repulsion phase?
A
In genetic linkage, it means each chromosome has one dominant and one recessive allele.
3
Q
What is coupling phase?
A
In genetic linkage, it means each chromosome has either two dominant or two recessive alleles.
4
Q
What is recombination frequency?
A
- Number of recombinants from a three point cross
- 1% is one map unit
- Smaller frequency means fewer chiasmata so the loci are closer
5
Q
What pattern of inheritance are brachydactyly and cystic fibrosis?
A
Brachydactyly- autosomal dominant
Cystic fibrosis- autosomal recessive
6
Q
What ratio does a dihybrid cross result in with complete dominance?
A
9:3:3:1
7
Q
How do you calculate the number of possible gametes as a result of independent assortment?
A
2^ Number of loci
8
Q
How do you calculate the possible number of F2 genotypes from independent assortment?
A
3^ Number of loci
