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  4. Which of the following terms represents a pair of contrasting character ?

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Q. Which of the following terms represents a pair of contrasting character ?

AIIMSAIIMS 1994Principles of Inheritance and Variation

Solution:

"Allele" is a term which indicates alternative forms of the same gene. For example "D" and "d" are two allelomorphs of the gene for plant height. In pure tall or pure dwarf plants, same allele is duplicated (DD or dd), while in hybrid tall both the alleles will be present (Dd). An individual is having only one allele or in other words two identical alleles, is known as homozygous (DD or dd). Similarly, an individual, having two different alleles will be called heterozygous or hybrid (Dd).