Multiple Choice
A trait that exhibits continuous variation (such as human height) is called a(n) ______ trait.
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3. Extensions to Mendelian Inheritance
Variations of Dominance
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Which term describes a genotype that contains two different alleles at a given locus?
A
Homozygous
B
Heterozygous
C
Nullizygous
D
Hemizygous
Verified step by step guidance1
Understand the definition of genotype: it refers to the genetic makeup of an organism at a specific locus, which can include one or more alleles.
Recall that alleles are different versions of a gene that can exist at the same locus on homologous chromosomes.
Identify the term 'homozygous' as describing a genotype where both alleles at a locus are the same (e.g., AA or aa).
Recognize that 'heterozygous' describes a genotype where the two alleles at a locus are different (e.g., Aa).
Note that 'nullizygous' and 'hemizygous' refer to other specific genetic conditions and do not describe having two different alleles at a locus.
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