2. Dihybrid Inheritance and Multiple Alleles

Question 1

define multiple allele crosses

Answer 1

a type of co-dominance when a gene has more than two alleles

Question 2

what gene codes for antigens on the surface on red blood cells

Answer 2

immunoglobulin gene (I)

Question 3

name the three types of possible antigens from the immunoglobulin gene

Answer 3

I^A I^B I^0

Question 4

I^A and I^B are __________

Answer 4

co-dominant

Question 5

I^0 is recessive to _____

Answer 5

both

Question 6

name the possible phenotypic ratio for multiple allele crosses

Answer 6

3:1 (B,O) OR 1:1:1:1 (AB,B,A,O)

Question 7

define dihybrid inheritance

Answer 7

when two characteristics are inherited from two different genes which have alleles

Question 8

what is the phenotypic ratio of heterozygous dihybrid inheritance

Answer 8

9:3:3:1

Question 9

why might the expected phenotypic ratio not be reached in dihybrid inheritance

Answer 9

linkage, epistasis

Question 10

define monohybrid inheritance

Answer 10

inheritance of one pair of alleles