Question

In: Biology

Give the expected genotypic and phenotypic ratios for the following crosses for ABO blood types: IAi...

Give the expected genotypic and phenotypic ratios for the following crosses for ABO blood types:

I^Ai x I^Bi =

I^AI^B x I^Ai

I^AI^B x I^AI^B

ii x I^Ai

I^AI^B x ii

Expert Solution

Co-dominant allele determine human blood type. There are three different alleles for human bloos group, known as I^A, I^B, and i. The I^A and I^B alleles are codominant, while the i allele is recessive.

There are four blood groupsin humans: A, B, AB and O. A and B individuals can be homozygous (I^AI^A, or I^BI^B) or heterozygous ((I^Ai or I^Bi, respectively).

1) I^Ai X I^Bi

		I^Bi
		I^B	i
I^Ai	I^A	I^AI^B AB blood group	I^Ai A blood group
	i	I^Bi B blood group	ii O blood group

Genotype ratio: 1 I^AI^B : 1 I^Ai : I^Bi: 1 ii

Phenotype Ratio: 1 AB : 1A: 1B :1 O

2) I^AI^B x I^Ai

		I^Ai
		I^A	i
I^AI^B	I^A	I^AI^A A blood group	I^Ai A blood group
	I^B	I^AI^B AB blood group	I^Bi B blood group

Genotype ratio: 1 I^AI^A : 1 I^AI^B : I^Ai: 1 I^Bi

Phenotype Ratio: 2A: 1 AB : 1B

3) I^AI^B x I^AI^B

		I^AI^B
		I^A	I^B
I^AI^B	I^A	I^AI^A A blood group	I^AI^B AB blood group
	I^B	I^AI^B AB blood group	I^BI^B B blood group

Genotype ratio: 1 I^AI^A : 2 I^AI^B : 1 I^BI^B

Phenotype Ratio: 1A: 2 AB : 1B

4) ii x I^Ai

		I^Ai
		I^A	i
ii	i	I^Ai A blood group	ii O blood group
	i	I^Ai A blood group	ii O blood group

Genotype ratio: 2 I^Ai : 2 ii

Phenotype Ratio: 2 A : 2O

5) I^AI^B x ii

		ii
		i	i
I^AI^B	I^A	I^Ai A blood group	I^Ai A blood group
	I^B	I^Bi B blood group	I^Bi B blood group

Genotype ratio: 2 I^Ai : 2 I^Bi

Phenotype Ratio: 2 A : 2B

gladiator answered 3 years ago

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