Which type of herbivore only requires one dominant allele to show the phenotype?

Which type of herbivore only requires one dominant allele to show the phenotype?

• A. Simple Recessive Heredity
• B. Simple Dominant Heredity
• C. Complex Dominant Heredity
• D. Polygenic Inheritance

Answer: (B)

In the context of genetics and heredity, a phenotype that requires only one dominant allele for its expression is characteristic of simple dominant heredity. This means that if an individual has at least one copy of the dominant allele, the associated trait will be displayed. For example, if we consider a trait where the dominant allele (let's say "A") is responsible for a certain characteristic, both homozygous dominant individuals (AA) and heterozygous individuals (Aa) will exhibit that phenotype. This is fundamental to our understanding of Mendelian inheritance patterns, where the presence of a single dominant allele is sufficient for the trait to be expressed. In contrast, other inheritance types mentioned do not fit the criteria. Simple recessive heredity requires two recessive alleles to show the phenotype, while complex dominant heredity involves more intricate patterns of dominance that may influence how traits manifest. Polygenic inheritance involves multiple genes contributing to a trait, making the expression of that trait more dependent on the combined effects of multiple alleles rather than a single dominant allele. Thus, simple dominant heredity is the correct answer as it directly describes the mechanism by which a single dominant allele can determine a phenotype.

In the context of genetics and heredity, a phenotype that requires only one dominant allele for its expression is characteristic of simple dominant heredity. This means that if an individual has at least one copy of the dominant allele, the associated trait will be displayed.

For example, if we consider a trait where the dominant allele (let's say "A") is responsible for a certain characteristic, both homozygous dominant individuals (AA) and heterozygous individuals (Aa) will exhibit that phenotype. This is fundamental to our understanding of Mendelian inheritance patterns, where the presence of a single dominant allele is sufficient for the trait to be expressed.

In contrast, other inheritance types mentioned do not fit the criteria. Simple recessive heredity requires two recessive alleles to show the phenotype, while complex dominant heredity involves more intricate patterns of dominance that may influence how traits manifest. Polygenic inheritance involves multiple genes contributing to a trait, making the expression of that trait more dependent on the combined effects of multiple alleles rather than a single dominant allele. Thus, simple dominant heredity is the correct answer as it directly describes the mechanism by which a single dominant allele can determine a phenotype.