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Zorluk: OrtaGenetics and Heredity

An organism that displays a dominant phenotype must possess a homozygous genotype for that specific trait.

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False. An organism exhibiting a dominant phenotype can possess either a homozygous dominant or a heterozygous genotype.
In complete dominance, a dominant allele masks the expression of a recessive allele. An individual can express the dominant phenotype through two distinct genotypes: homozygous dominant (having two copies of the dominant allele) or heterozygous (having one dominant and one recessive allele). Thus, displaying the dominant phenotype does not require a homozygous genotype.

Adım Adım Çözüm

1
Distinguish between genotype and phenotype under Mendelian inheritance.
Genotype represents the specific combination of alleles (AAAA, AaAa, or aaaa), whereas phenotype represents the observable physical characteristic.
To establish the relationship between genetic makeup and outward physical expression.
2
Identify which genotypes yield a dominant phenotype in a complete dominance system.
Both homozygous dominant (AAAA) and heterozygous (AaAa) genotypes result in the dominant phenotype because the dominant allele masks the recessive allele.
To evaluate whether a homozygous genotype is strictly required to express the dominant phenotype.
3
Assess the validity of the statement.
Because heterozygous individuals (AaAa) also express the dominant phenotype, having a dominant phenotype does not guarantee a homozygous genotype.
To determine the final true/false evaluation of the statement.

Anahtar Kavram

Dominant and Recessive Alleles in Genotype versus Phenotype Expression
Tahmini Süre:45s
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Genetics and Heredity

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