Multiple Choice
In a simple Mendelian trait where A is the dominant allele and a is the recessive allele, which genotype is homozygous dominant?
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1. Introduction to Genetics
Fundamentals of Genetics
Multiple Choice
In the context of fundamentals of genetics, what is an organism’s phenotype?
A
The observable traits of an organism, resulting from the interaction of its genotype and environment
B
The complete set of DNA sequences (alleles) an organism carries
C
The frequency of a particular allele in a population
D
A heritable unit of DNA that encodes a functional product such as a protein or RNA
Verified step by step guidance1
Step 1: Understand the term 'phenotype' in genetics. Phenotype refers to the observable characteristics or traits of an organism, such as height, eye color, or blood type.
Step 2: Recognize that phenotype results from the interaction between an organism's genotype (its genetic makeup) and the environment in which it lives.
Step 3: Differentiate phenotype from genotype. Genotype is the complete set of DNA sequences (alleles) an organism carries, which is not directly observable.
Step 4: Note that phenotype is not related to allele frequency in a population, which is a population genetics concept, nor is it a single heritable unit of DNA (gene).
Step 5: Conclude that the correct definition of phenotype is the observable traits of an organism, resulting from the interaction of its genotype and environment.
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