Question

child may have two type A parents Atyne child may have one type AB parent Atype child may have two type AB parents A type A child may have one type o parent. p e R head issuing to AR BIbled for child support, claiming that he is the father of Rh blood). On the basis of blood type, is it possible that Joe is the other A BO blodtypis) would Joe have to Sess to prove that he is not the father A W 5 DIHYBRID CROSSES WITH DOMINANCE Determine the phenotype ratio in progeny of a cross between two yellow-round dihybrid pea plants. Parent phenotypes Parent genotypes Gametes Punnett square

Answer 1

4.a

1. I^AI^B x ii

Genotypic ratio---I^Ai and I^Bi are in 1:1 ratio.

Phenotypic ration A and B type in 1:1 ratio.

ΙΑΙΒ X ii - IA IB i la I Bil 50'). - 19 i l1 TB 601-18 i 50% A type 50%. I type

2. I&Ai x I^Bi

Genotypic ratio--- I^AI^B, I^Ai,I^Bi and ii are in 1:1:1:1 ratio.

Phenotypic ration is A, B, Ab and O types of blood in 1:1:1:1 ratio.

4b. True or false.

1. A type O child may have 2 A type parents---true

2. A type O child may have one type AB parent---false.

3. A type B child may have two type AB parents---ture

4. A type AB child may have one O parent---false.

4c.

Yes, Joe can be the father of the child because, he has AB type of blood and the mother is A type. So the child can be B type. This can happen if the mother is heterozygous for A type (I^Ai). In this scenario, child can be B type.

Father is -ve Rh. Mother +Rh. Because +ve is dominant, child can be +ve too. That is why the child can be Joe's bilogical child.

If Joe had 'O' type of blood, than he may not be the father.

I^A_ mother and father ii(O type ) will always give A type, not B type. Even if he is B type, I^B_, child will be B type.