Lecture 9

Question 1

2^n

Answer 1

n = number of pairs of chromosomes

Question 2

Dihybrid Cross

Answer 2

Pure breeding parents –> heterozygote offspring, they interbreed
16 possible combinations (2 genes)
- assuming complete dominance for both genes (9:3:3:1)

Question 3

Test Cross

Answer 3

Used to establish the genotype of an individual with the dominant phenotype
Cross to a homozygous recessive genotype
appearance of recessive genotype indicates heterozygosity

Question 4

Back Cross

Answer 4

a cross of an F1 to one of its parents/identical genotype

Question 5

Gene Interaction

Answer 5

When two or more genes influence the same phenotypic trait/ two genes interact to determine one trait (eg. coat colour and density of coat colour)