GEN Lecture 4

Question 1

Heterochromatins:

Answer 1

Repetitive DNA sequences not organised into genes

Question 2

Types of allelic interactions:

Answer 2

Completely dominant, incompletely dominant, co-dominant

Question 3

Complete dominance

Answer 3

When the phenotypic effect is the same in both the heterozygous and homozygous conditions.

Question 4

Incomplete dominance:

Answer 4

The dominant allele is not fully expressed in heterozygotes. The heterozygote has an intermediate phenotype.

Question 5

Co-dominance

Answer 5

Full expression of both alleles in the heterozygote.

Question 6

Polygenic inheritance:

Answer 6

mode of inheritance in which the additive effect of two or more genes determines a single phenotype character. A single trait affected by an umber of genes.