Lecture 15 (inheritence 3)

Question 1

Sex chromosomes

Answer 1

Can either be heterogametic where there is two different chromosomes like XY or homogametic like XX. Heterogametic sex only gets one functorial X chromosome.

Question 2

Sex-link inheritance

Answer 2

Ex: Fathers cannot pass on X-linked genes to sons. The reason is because the father would only be able to ass y chromosome and receives one functional X chromosome than mother. Also, no recombination takes place between these chromosomes.

Question 3

Pleiotropy

Answer 3

one gene effects multiple traits

Question 4

Epistasis

Answer 4

When multiple genes interact to determine the phenotype. I.e genes can affect other genes that affect the phenotype

Question 5

Multiple loci can generate even more variation addition effects.

Answer 5

each allele contributes to the phenotype

Question 6

Plasticity

Answer 6

The ability of a genotype to express multiple phenotypes based on the environment.