Topic 13 pt 1: Gene Inheritance

Question 1

What is an allelic interaction

Answer 1

Interaction between alleles at the same locus/gene -> monohybrid

Question 2

What is a gene interaction

Answer 2

Interactions between alleles at different loci/genes -> dihybrid

Question 3

Quantitative/continuous trait

Answer 3

Dozens of genes can be affecting
e.g. height

Question 4

When two genes affect the same trait, what happens to the ratio of the dihyrbid cross?

Answer 4

9:3:3:1 but with new phenotypes

Question 5

Epistatic vs hypostatic gene/allele

Answer 5

Epistatic = one allele is expressed over the others (“dominant”)
Hypostatic = expression is masked by epistatic gene/allele (“recessive”)

Question 6

Epistatic interactions occur when…

Answer 6

Alleles at one locus mask or trump expression of alleles at a different locus

Question 7

How is epistatic interaction different than dominance

Answer 7

Involves alleles at different genes

Question 8

Look at all the slides ***

Answer 8

Important