Lecture 18 - independent assortment

Question 1

what are Mendel’s laws?

Answer 1

1) law of segregation
- alternative versions of genes account for variations in inherited characters (different alleles confer different traits). individuals inherit 2 alleles from each character, one from each parent, and alleles segregate in progeny.
2) law of independent assortment
- alleles of different gene assort independently of each other.

Question 2

what is a di-hybrid cross?

Answer 2

inheritance of two independent traits
> for genes on separate chromosomes
> each allele pair shows independent segregation
> F1 produces four gamete genotypes 
> F2 shows 9:3:3:1 phenotypes

Question 3

what is an example of a sex linked gene?

Answer 3

colour blindness
> 5-10% of males cannot distinguish red and green
> colour blind males never transmit their allele to their sons, but can transmit to grandsons via carrier daughters.

Question 4

what does hemizygous mean?

Answer 4

males are hemizygous for x linked genes