Question

1. For the trait pod shape, pea plants are either inflated (Q), or constricted (q). Inflated is the dominant form. In the P generation, A homozygous dominant pea plant is crossed with a plant possessing the constricted phenotype. What would the genotype of the F1 generation be?

qq

QQ

All possible genotypes would be seen in the F1 generation

Qq

2. In horses, a black mane (B) is dominant to a blond mane (b). A horse with a black mane is mated to one with a blond mane. They have several offspring, some with black manes and some with blond-manes. What is the genotype of the blond-maned parent?

can not be determined

Bb

bb

BB

3. Human ABO blood type is a non-mendelian trait. Three Alleles (IA, IB, and i) code for four blood types (A, B, AB, and O). Individuals with the genotype IA IB fully express both alleles, therefore the AB blood group is an example of…

Pleiotropy

incomplete dominance

codominance

polygenic inheritance

Answer 1

1. Qq

Inflated = QQ, Qq

Constricted = qq

QQ × qq = Qq (inflated)

2. bb

Black mane = BB, Bb

Blond mane = bb

(The dominant allele will express itseld in both homozygous dominant and heterozygous condition but the recessive allele will express itself only in homozygous recessive condition).

3. Codominance

Codominance is the type of non mendelian inheritance in which the two alleles are equally dominant over each other and in the heterozygotes, we see a variegated phenotype.

Incomplete dominance is the type of non mendelian inheritance in which the dominant allele is partially dominant over the recessive allele and therefore we see an intermediate phenotype in the heterozygotes.

Polytechnic inheritance is the type of inheritance in which a trait is controlled by more than one genes.

Pleiotropy is the type of inheritance in which one gene is responsible for controlling many traits.

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