Haploids are preferred over diploids for mutation studies because…

MCQ

Haploids are preferred over diploids for mutation studies because:

✓
Recessive mutation is expressed in $\mathrm F_1$.
B
Recessive mutation is expressed in $\mathrm F_2$.
C
Dominant phenotype is expressed.
D
Dominant phenotype is suppressed.

✓

Answer

Correct option: A.

Recessive mutation is expressed in $\mathrm F_1$.

Dominant mutations are the one that expresses themselves in heterozygotes as well as in homozygous dominant genotypes; thus a cross between two pure breeding genotypes produces the dominant phenotype in $\mathrm F_1$ hybrid. This means that dominant mutations are expressed in successive generations of diploids; options $C$ and $D$ are incorrect in respect to the question. Recessive mutations are suppressed by the presence of wild$-$type dominant alleles in diploids and are expressed only in recessive homozygotes; their detections need development of hybrid line by the cross between two pure varieties followed by selfing of hybrid to obtain recessive homozygotes in $\mathrm F_2$ generation. Since haploids carry a single copy of allele for a gene, they express both dominant and recessive mutations in successive generations which makes option $B$ incorrect and option $A$ correct.

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