AP BIOLOGY

HEREDITY

THE PEDIGREE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which answer best describes codominant alleles?
A
Both are equally dominant
B
Both are equally recessive
C
Neither are dominant or recessive
Explanation: 

Detailed explanation-1: -Codominance is a form of inheritance wherein the alleles of a gene pair in a heterozygote are fully expressed. As a result, the phenotype of the offspring is a combination of the phenotype of the parents. Thus, the trait is neither dominant nor recessive.

Detailed explanation-2: -Correct answer: Codominance means that more than one type of dominant allele for the same gene is present.

Detailed explanation-3: -Codominance. Codominance refers to the dominance in which the two alleles or traits of the genotypes (of both homozygotes) are expressed together in offspring (phenotype). There is neither a dominant nor recessive allele in cross-breeding.

Detailed explanation-4: -The best example of codominance is ABO blood group. ABO blood grouping is controlled by gene I which has three alleles A, B, and O and show codominance.

Detailed explanation-5: -Codominance occurs when both alleles show dominance, as in the case of the AB blood type (IA IB) in humans. Furthermore, the human ABO blood groups represent another deviation from Mendelian simplicity since there are more than two alleles (A, B, and O) for this particular trait.

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