Chapter 20 Flashcards
1
Q
Dihybrid Inheritance
A
Inheritance of two genes controlled by different genes
Mendels pea plants
2
Q
Codominance
A
Both alleles are expressed but neither is recessive
Pink flowers
3
Q
Autosomnal linkage
A
Genes are linked that are found on the same chromosome so inherited as one
4
Q
What is the genotypic ratio of alleles that are autosomally linked
A
1:1:1
5
Q
Epistasis
A
Interaction of genes at different loci
Hypostatic gene (one being affected) Epistatic gene (gene causing masking)
6
Q
Allopatric speciation
A
Physical barrier
7
Q
Sex linkage
A
Genes that are carrier on a sex chromosome
Haemophilia
8
Q
Stabilising selection
A
Natural selection that favours average phenotypes
9
Q
Directional selection
A
Natural selection that favours extreme phenotypes
10
Q
Disruptive selection
A
Natural selection that favours both extreme phenotypes
11
Q
Polymorphic
A
Display more than one distinct phenotype
