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Principles Of Inheritance And Variation

Question

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Differentiate between the following :
(a) Dominance and Recessive

(b) Homozygous and heterozygous

(c) Monohybrid and dihybrid.

Solution

(a)

Dominance	Recessive
1. When the allele expresses itself in both heterozygous as well as homozygous condition.	1. When the allele expresses itself only in homozygous condition.
2. The allele is unmodified and functional.	2. The allele is modified and non-functional.

(b)

Homozygous	Heterozygous
1.Condition where both the alleles of the gene are same.	1.Condition where the alleles are different.
2.The gametes formed from them are same.	2. The gametes formed from them are different.
eg. TT or tt	eg. Tt

(c)

Monohybrid	Dihybrid
1. When an individual is heterozygous for genes controlling one character it is called monohybrid	1. When an individual is heterologous for genes controlling two characters it is called dihybrid.
2. In F2 generation it produces a phenotypic ratio of 3:1.	2. In F2 generation it produces a phenotypic ratio of 9:3:3:1

Some More Questions From Principles of Inheritance and Variation Chapter

Write down Mendel’s dihybrid Phenotypic ratio

Who were the rediscoverers of Mendelism ?

What are the real determinants of what an organism will become ?

What is the unique feature of F1 generation ?

What will be the genetic make up of an organism which suffers from sickle cell anaemia ?

What do the symbols square and circle in a pedigree chart indicate ?

Define heterogamy. Give an example.

How many chromosomes are found in human cells ?

Why is male Drosophila regarded as heterogametic ?

What term is used for the two chromatids resulting from the interchange of segments during crossing over ?

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