Red (RR) Antirrhinum is crossed with white (WW) one. Offspring are pink (RW). This is an example of:
Correct answer: B. Incomplete dominance
- A. Dominance
- B. Incomplete dominance
- C. Hybrid
- D. Supplementary genes
Explanation
The correct option is b) Incomplete dominance. In the given scenario, the cross between a red (RR) Antirrhinum (snapdragon) and a white (WW) one results in pink offspring (RW). This is an example of incomplete dominance, also known as intermediate inheritance. Incomplete dominance occurs when the heterozygous genotype (RW) produces an intermediate phenotype that is a blend or combination of the two homozygous phenotypes (red and white). In this case, the pink color of the offspring is a result of incomplete dominance, where neither the red allele nor the white allele is completely dominant over the other.
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Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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