Question

Mendel showed that unit factors, now called alleles, exhibit a dominant/recessive relationship. In a monohybrid cross, the .................... trait disappears in the first filial generation.

• A. Dominant
• B. Co-dominant
• C. Recessive
• D. Semi-dominant

Answer 1

The correct option is C Recessive

• Mendel's law of dominance states that in a cross the dominant allele will mask the expression of the recessive allele.
• The recessive allele will be present but it will not express itself. Hence in a monohybrid cross between homozygous dominant and homozygous recessive the progenies of F${}_1$ generation will express dominant traits but the recessive traits will not be seen.
• However, the recessive trait will express in the F${}_2$ generation.
  Thus, the correct answer is option C.