analytical approaches in genetics

Question 1

what are the phenotypic and genotypic ratios of crossing two heterozygotes?

Answer 1

genotype = 1:2:1
phenotype = 3:1

Question 2

what is the phenotypic ration for a dihybrid cross between heterozygotes?

Answer 2

9:3:3:1

Question 3

sex linked traits are much more common in _________

Answer 3

males

Question 4

T / F - the further apart two genes are, the more likely it is that there will be a point of crossing over between them

Answer 4

true

Question 5

how often an allele appears in a population is known as its ____________

Answer 5

allele frequency

Question 6

what are the five criteria that are mandatory for the hardy-weinberg principle?

Answer 6

1. very large population
2. no muations that affect the gene pool
3. mating between individuals is random
4. no migratio of individuals into / out of the population
5. genes in the population are all equally successful at being reproduced

Question 7

what are the two equations used to predict allelic / phenotypic frequencies if the population is in a hardy-weinberg equilibrium?

Answer 7

p + q = 1

p^2 + 2pq + q^2 = 1