RR (Red) Antirrhinum is crossed with white (WW) one. Offspring RW are pink. This is an example of
Correct answer: B. Incomplete dominance
- A. Dominant-recessive
- B. Incomplete dominance
- C. Hybrid
- D. Supplementary genes
Explanation
The inheritance pattern observed in the cross between red (RR) and white (WW) Antirrhinum, resulting in pink (RW) offspring, is an example of incomplete dominance. In incomplete dominance, the heterozygous phenotype is an intermediate of the two homozygous phenotypes. This is evidenced by the pink color of the RW offspring, which is a blend of the red and white colors of the parents. In contrast, dominant-recessive inheritance would result in offspring displaying only the dominant phenotype. The term 'hybrid' does not specify the nature of the genetic interaction, and 'supplementary genes' refer to a different genetic interaction not demonstrated in this example.
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About Inheritance
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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