In simple dominant heredity, how many alleles need to be inherited to express the dominant trait?

In simple dominant heredity, how many alleles need to be inherited to express the dominant trait?

• A. Both from each parent
• B. Only one from either parent
• C. Three alleles from one parent
• D. None, it is automatically expressed

Answer: (B)

In simple dominant heredity, the expression of a dominant trait requires only one copy of the dominant allele. This means that an individual can inherit the dominant allele from just one parent and still display the dominant trait. The presence of the dominant allele will mask the effect of any recessive allele that may be inherited from the other parent. Therefore, receiving a single dominant allele is sufficient for the dominant characteristic to be expressed in the offspring. This principle is fundamental in genetics, often illustrated by Mendel's experiments with pea plants, where traits such as flower color could be determined by just one allele being present in the genotype. The concept reflects the way dominant and recessive traits function in inheritance patterns.

In simple dominant heredity, the expression of a dominant trait requires only one copy of the dominant allele. This means that an individual can inherit the dominant allele from just one parent and still display the dominant trait. The presence of the dominant allele will mask the effect of any recessive allele that may be inherited from the other parent. Therefore, receiving a single dominant allele is sufficient for the dominant characteristic to be expressed in the offspring.

This principle is fundamental in genetics, often illustrated by Mendel's experiments with pea plants, where traits such as flower color could be determined by just one allele being present in the genotype. The concept reflects the way dominant and recessive traits function in inheritance patterns.