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Botany MCQs for NEET — Practice Questions with Answers

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Which of the following terms best describes when the phenotype of the heterozygote differs from the phenotypes of both homozygotes?

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Explanation

Complete dominance occurs when the heterozygote phenotype is indistinguishable from that of the homozygous parent. The heterozygote phenotype differs from the phenotypes of both homozygote parents is a demonstration of partial or incomplete dominance. Codominance occurs when the phenotypes of both parents are simultaneously expressed in the same offspring organism.

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The gene for eye color in a certain organism has seven alleles. How many genotypic combinations are possible?

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Explanation

Given n alleles at a locus, the number genotypes possible is the sum of the integers between 1 and n: With 2 alleles, the number of genotypes is 1 + 2 = 3. 3 alleles there are 1 + 2 + 3 = 6 genotypes. 4 alleles there are 1 + 2 + 3 + 4 = 10 genotypes.

For 7 alleles = 1+2+3+4+5+6+7 =28.

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Diseases that are caused by the malfunction of a pleiotropic gene are:

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Explanation

Diseases caused by the malfunction of a pleiotropic gene, which affects multiple traits, are often called syndromes. Pleiotropic genes have widespread effects on various aspects of the organism's development and function. When these genes malfunction, it can lead to a constellation of symptoms and phenotypic effects, collectively referred to as a syndrome.

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Out of a pair of monozygotic twins, one develops hare lip and the other does not. This can be an example of the genetic phenomenon of:

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Explanation

In incomplete or reduced penetrance, some individuals will not express the trait even though they carry the allele.

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The mapping of genes on chromosome was attempted by

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Explanation

NCERT Page No. 83

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Today ________ are extensively used as a _______ point in the sequencing of whole genome

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Explanation

NCERT Page No. 84

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The initial studies for sex determination were done over

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Explanation

NCERT Page No. 85

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The concept of X body was given by

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Explanation

NCERT Page No. 85

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Among human males _______ chromosome is present but its counterpart is _____ and called ______ chromosome.

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Explanation

NCERT Page No. 86

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In which of the following male heterogamety is not observed?

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Explanation

NCERT Page No. 86

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