Multiple Choice
Which of the following best describes how the genotype of an individual influences their phenotype?
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13. Mendelian Genetics
Genotype vs. Phenotype
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In the context of genetics, if an organism exhibits a recessive trait, what is its genotype?
A
Homozygous recessive
B
Homozygous dominant
C
Hemizygous
D
Heterozygous
Verified step by step guidance1
Understand the concept of dominant and recessive traits: In genetics, traits are determined by alleles, which are different forms of a gene. Dominant alleles mask the expression of recessive alleles when both are present.
Define genotype: Genotype refers to the genetic makeup of an organism, specifically the alleles present at a particular gene locus.
Identify the genotype for recessive traits: For an organism to exhibit a recessive trait, it must have two copies of the recessive allele, as the presence of a dominant allele would mask the recessive trait.
Recognize the term 'homozygous recessive': This term describes an organism that has two identical recessive alleles for a particular gene, allowing the recessive trait to be expressed.
Eliminate other options: Homozygous dominant refers to two dominant alleles, heterozygous refers to one dominant and one recessive allele, and hemizygous typically refers to having only one allele of a gene, often seen in sex-linked traits.
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