Multiple Choice
In the context of variations of dominance, which term describes a situation in which one allele masks or “overshadows” the phenotypic effect of another allele in a heterozygote?
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3. Extensions to Mendelian Inheritance
Variations of Dominance
Multiple Choice
Which of the following parents could produce offspring with an AB blood type?
A
A x A
B
O x A
C
A x AB
D
AB x O
Verified step by step guidance1
Understand the basics of blood type inheritance: Blood type is determined by the presence of antigens on the surface of red blood cells. The ABO blood group system includes four main types: A, B, AB, and O.
Recognize the genotypes associated with each blood type: Type A can be AA or AO, Type B can be BB or BO, Type AB is AB, and Type O is OO.
Identify the possible alleles each parent can pass on: A parent with blood type A can pass on either an A or an O allele, a parent with blood type B can pass on a B or an O allele, and a parent with blood type AB can pass on either an A or a B allele.
Determine the combinations that can result in an AB blood type: For a child to have an AB blood type, they must inherit an A allele from one parent and a B allele from the other parent.
Analyze the given parent combinations: Only the combination of A x AB can produce an offspring with an AB blood type, as the A parent can provide an A allele and the AB parent can provide a B allele.
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