Genetics

Question 1

What is the Hardy Weinberg principle?

Answer 1

In a stable population with no disturbing factors, the allele frequencies remain constant with no evolution over generations.

Question 2

What does the Hardy Weinberg principle assume?

Answer 2

It assumes that the population is large, there is random mating, no selective advantage, and there is no mutation.

Question 3

What are the Hardy Weinberg equations?

Answer 3

1) p + q = 1

p = frequency of dominant allele
q = frequency of recessive allele

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

p^2 = frequency of genotype DD
2pq = frequency of Dd
q^2 = frequency of genotype dd

Question 4

Define monogenic inheritance.

Answer 4

Inheritance of characteristics controlled by a single gene.

Question 5

Define dihybrid inheritance.

Answer 5

Inheritance of 2 characteristics controlled by different genes.

Question 6

Define autosomal linkage.

Answer 6

2 genes found on the same chromosome so inherited together.

Question 7

Define co-dominance.

Answer 7

Both alleles are expressed as neither are recessive.

Question 8

Define sex linkage.

Answer 8

Any gene carried on the X/Y chromosome is sex linked.

Question 9

Define dominant epistasis.

Answer 9

Dominant allele at one locus masks the expression of another gene at a second locus.De

Question 10

Define recessive epistasis.

Answer 10

2 recessive alleles at one gene locus mask the expression of alleles at a second locus.

Question 11

Define complementary recessive.

Answer 11

The presence of a particular allele at each locus is required for the expression of a particular phenotype.

Question 12

What is the typical ratio with heterozygous parents for monogenic inheritance?

Answer 12

3:1

Question 13

What is the typical ratio with heterozygous parents for dihybrid inheritance?

Answer 13

9:3:3:1