What does Mendel's first law (Dominance) state according to the material?

What does Mendel's first law (Dominance) state according to the material?

• A. The recessive allele is always expressed in the phenotype
• B. The heterozygous offspring show both traits equally
• C. When both parents are homozygous only form of the trait will appear in the next generation, the offspring will only exhibit the dominant trait in the phenotype
• D. Alleles from each parent always blend

Answer: (C)

Dominance means the allele that is expressed in the phenotype hides the other allele when present in a heterozygous state, and the two alleles separate during gamete formation. When both parents are homozygous for contrasting alleles, one being dominant and the other recessive (for example, AA × aa), every offspring inherits one dominant and one recessive allele, becoming Aa. The dominant allele then determines the phenotype in all offspring, so only the dominant trait appears in the next generation. This illustrates how dominance operates across a simple cross. The other statements don’t fit Mendelian patterns: the recessive allele is not always expressed, since heterozygotes show the dominant trait; heterozygous offspring do not display both traits equally; and alleles do not blend in Mendelian inheritance.

Dominance means the allele that is expressed in the phenotype hides the other allele when present in a heterozygous state, and the two alleles separate during gamete formation. When both parents are homozygous for contrasting alleles, one being dominant and the other recessive (for example, AA × aa), every offspring inherits one dominant and one recessive allele, becoming Aa. The dominant allele then determines the phenotype in all offspring, so only the dominant trait appears in the next generation. This illustrates how dominance operates across a simple cross.

The other statements don’t fit Mendelian patterns: the recessive allele is not always expressed, since heterozygotes show the dominant trait; heterozygous offspring do not display both traits equally; and alleles do not blend in Mendelian inheritance.