codominance

Question 1

is codominance monogenic inheritance

Answer 1

yes

Question 2

define a dominance pattern

Answer 2

how two alleles for a gene interact

Question 3

define codominance

Answer 3

when two different alleles for a gene are equally expressed in an organism’s phenotype, none of them are dominant or recessive

Question 4

how is this different to complete dominance

Answer 4

usually the dominant allele is expressed e.g Bg, blue eyes is expressed, the B allele hides the g one

Question 5

how do you represent alleles

Answer 5

using subscripts for example C for the gene and the subscript W for the allele causing the expression of white flowers and the subscript R for the allele causing the expression of red flowers

Question 6

1) write the gametes for a pink flower carrying C^R C^W

Answer 6

C^R and C^W

Question 7

2) write the gametes for a white flower carrying C^R C^W

Answer 7

C^R and C^W

Question 8

3) write the F1 offspring genotypes

Answer 8

C^R C^W

C^R C^W

C^R C^R

C^W C^W

Question 9

4) write the phenotypic ratio

Answer 9

2 pink : 1 white : 1 red

Question 10

can a gene have more than two possible alleles

Answer 10

yes but an organism will only carry two alleles

Question 11

in humans, what alleles can exhibit codominance for blood group

Answer 11

I^A and I^B, I^O is recessive to both of them

Question 12

1) write the gametes for a mother which has the blood group A

Answer 12

I^A and I^O

Question 13

2) write the gametes for a father which has the blood group B

Answer 13

I^B and I^O

Question 14

3) write the F1 offspring genotypes

Answer 14

I^A I^B, blood group AB

I^O I^O, blood group O

I^A I^O, blood group A

I^B I^O, blood group B

Question 15

4) write the phenotypic ratio

Answer 15

I AB : 1 B : 1 O : 1 A