Question

The ABO blood groups in humans are expressed as the $I^{4}, I^{B},$ and $i$ alleles. The $I^{A}$ allele encodes the A blood group antigen, $I^{B}$ encodes $B$ and $i$ encodes O. Both $A$ and $B$ are dominant to $0 .$ If a heterozygous blood type A parent $\left(I^{A} i\right)$ and a heterozygous blood type B parent ( $I^{B} i$ ) mate, one quarter of their offspring are expected to have the AB blood type $\left(r^{A} I^{B}\right)$ in which both antigens are expressed equally. Therefore, ABO blood groups are an example of: a. multiple alleles and incomplete dominance b. codominance and incomplete dominance c. incomplete dominance only d. multiple alleles and codominance

Name: Problem 11, Chapter 8: Concepts of Biology
Uploaded: 2020-06-01T02:20:37-08:00
Duration: 3 min 24 s
Channel: Aria Rotbart

   The ABO blood groups in humans are expressed as the $I^{4}, I^{B},$ and $i$ alleles. The $I^{A}$ allele encodes the A blood group antigen, $I^{B}$ encodes $B$ and $i$ encodes O. Both $A$ and $B$ are dominant to $0 .$ If a heterozygous blood type A parent $\left(I^{A} i\right)$ and a heterozygous blood type B parent ( $I^{B} i$ ) mate, one quarter of their offspring are expected to have the
AB blood type $\left(r^{A} I^{B}\right)$ in which both antigens are expressed equally. Therefore, ABO blood groups are an example of:
a. multiple alleles and incomplete dominance
b. codominance and incomplete dominance
c. incomplete dominance only
d. multiple alleles and codominance

Concepts of Biology

Samantha Fowler,… 1st Edition

Chapter 8, Problem 11

Instant Answer

Solved by Expert Aria Rotbart

06/01/2020

Step 1

In dominance, one gene is completely dominant over the other. This is the classic Mendelian genetics. For example, if we have a black fly and a white fly and they breed, the offspring will be black because the black gene is dominant. Show more…

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The ABO blood groups in humans are expressed as the $I^{4}, I^{B},$ and $i$ alleles. The $I^{A}$ allele encodes the A blood group antigen, $I^{B}$ encodes $B$ and $i$ encodes O. Both $A$ and $B$ are dominant to $0 .$ If a heterozygous blood type A parent $\left(I^{A} i\right)$ and a heterozygous blood type B parent ( $I^{B} i$ ) mate, one quarter of their offspring are expected to have the AB blood type $\left(r^{A} I^{B}\right)$ in which both antigens are expressed equally. Therefore, ABO blood groups are an example of: a. multiple alleles and incomplete dominance b. codominance and incomplete dominance c. incomplete dominance only d. multiple alleles and codominance

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Key Concepts

Multiple Alleles

This concept refers to a situation in which more than two allele forms exist in a population for a given gene. It expands the typical dominant-recessive dichotomy seen in simple Mendelian traits and allows for more genetic diversity within a species.

Codominance

Codominance occurs when two different alleles at a gene locus are both fully and simultaneously expressed in the phenotype of heterozygotes. This results in a phenotype where both allelic traits are equally visible, rather than one being masked by the other.

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