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B
Triploids
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C
Tetraploids
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D
Haploids
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Solution
The correct option is B Haploids Physical, chemical or biological agents that cause changes in chemical structure of a gene are termed as mutagens. Diploids have two copies of a gene, thus the presence of one functional copy is sufficient to ignore the effects of the mutation in the second copy. Similarly, triploids and tetraploids have three and four copies of a gene respectively wherein the effect of the mutation in one allele is masked by the presence of two and three functional copies. Since haploids carry the single copy of allele for a gene, they express both dominant and recessive mutations which make them more vulnerable to adverse effects of mutations.