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:

IAi x IBi =

IAIB x IAi

IAIB x IAIB

ii x IAi

IAIB x ii

Solutions

Expert Solution

Co-dominant allele determine human blood type. There are three different alleles for human bloos group, known as IA, IB, and i. The IA and IB 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 (IAIA, or IBIB) or heterozygous ((IAi or IBi, respectively).

1) IAi X IBi

IBi

IB

i

IAi

IA

IAIB

AB blood group

IAi

A

blood group

i

IBi

B

blood group

ii

O

blood group

Genotype ratio: 1 IAIB : 1 IAi : IBi: 1 ii

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

2) IAIB x IAi

IAi

IA

i

IAIB

IA

IAIA

A blood group

IAi

A blood group

IB

IAIB

AB blood group

IBi

B blood group

Genotype ratio: 1 IAIA : 1 IAIB : IAi: 1 IBi

Phenotype Ratio: 2A: 1 AB : 1B

3) IAIB x IAIB

IAIB

IA

IB

IAIB

IA

IAIA

A blood group

IAIB

AB blood group

IB

IAIB

AB blood group

IBIB

B blood group

Genotype ratio: 1 IAIA : 2 IAIB : 1 IBIB

Phenotype Ratio: 1A: 2 AB : 1B

4) ii x IAi

IAi

IA

i

ii

i

IAi

A blood group

ii

O blood group

i

IAi

A blood group

ii

O blood group

Genotype ratio: 2 IAi : 2 ii

Phenotype Ratio: 2 A : 2O

5) IAIB x ii

ii

i

i

IAIB

IA

IAi

A blood group

IAi

A blood group

IB

IBi

B

blood group

IBi

B

blood group

Genotype ratio: 2 IAi : 2 IBi

Phenotype Ratio: 2 A : 2B


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