Question

1.
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2. Differentiate between the following -
(a) Dominance and Recessive
(b) Homozygous and Hetrozygous
(c) Monohybrid and Dihybrid.​

Answer 1

Explanation:

Dominance Recessive

1. Dominant allele is able to express itself even in the presence of recessive allele. Recessive allele is unable to express its effect in the presence of dominant allele.

Answer 2

Answer:    (a) Dominance and Recessive

Dominance-A dominant factor or allele expresses itself in the presence or absence of a recessive factor.

For example, tall plant, round seed, violet flower, etc. are dominant traits in a pea plant.

Recessive-A recessive trait is able to express itself only in the absence of a dominant factor.For example, dwarf plant, wrinkled seed, white flower, etc. are recessive traits in a pea plant.

        (b) Homozygous and Heterozygous

Homozygous-It contains two similar alleles for a particular trait.Genotype for homozygous possess either dominant or recessive, but never both the alleles. For example, RR or rr.It produces only one type of gamete.

Heterozygous-It contains two different alleles for a particular trait.Genotype for heterozygous possess both dominant and recessive alleles. For example, Rr.It produces two different kinds of gametes.

(c) Monohybrid and Dihybrid

Monohybrid Cross-Monohybrid Cross involves cross between parents, which differs in only one pair of contrasting characters. For example, the cross between tall and dwarf pea plant is a monohybrid cross.

Dihybrid Cross-Dihybrid Cross involves cross between parents, which differs in two pairs of contrasting characters.For example, the cross between pea plants having yellow wrinkled seed with those having green round seeds is a dihybrid cross.

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