genetic diagrams

Question 1

define ‘monogenic’

Answer 1

inheritance of a single gene

Question 2

define ‘dihybrid’

Answer 2

inheritance of separate genes on different chromosomes

Question 3

what is the ratio for heterozygous dihybrid?

Answer 3

9:3:3:1

Question 4

define ‘sex linkage’

Answer 4

genes present on X and Y chromosomes - inherited from biological sex

Question 5

define ‘autosomal linkage’

Answer 5

inheritance of 2 genes on the same chromosome
- inherited together so either both dominant or both recessive

Question 6

define ‘multiple alleles’

Answer 6

genes with more than 1 allele

Question 7

define ‘epistasis’

Answer 7

genes at 1 locus interact with genes at another locus - masking expression

Question 8

define ‘codominant’

Answer 8

both alleles equally dominant so both expressed in the phenotype

Question 9

what is the ratio for heterozygous codominance?

Answer 9

1:1:2

Question 10

what is the ratio for heterozygous autosomal linkage?

Answer 10

3:1

Question 11

what is the ratio for heterozygous sex linkage?

Answer 11

1:1:2

Question 12

what is the ratio for recessive epistasis?

Answer 12

9:3:4 or 9:7

Question 13

what is the ratio for dominant epistasis?

Answer 13

12:3:1 or 13:3

Question 14

what is the ratio for reciprocal epistasis?

Answer 14

15:1