Answer :
Final answer:
A test cross in genetics is completed by crossing an organism with a homozygous recessive individual to ascertain the genotype of the organism. The correct choice representing a test cross from the given options is: Ww x ww.
Explanation:
In genetics, a test cross is used to determine an organism's genotype. Specifically, the organism in question is typically crossed with an individual that's homozygous recessive for the trait. The trait here being the white or 'W' phenotype. Therefore, the correct answer to your question, 'Which one of the following represents a test cross?' is option C: Ww x ww. This cross allows us to determine whether the 'W' organism is homozygous dominant (WW) or heterozygous (Ww), based on the phenotypes of the offspring produced. If all offspring exhibit the dominant phenotype (white in this case), then the tested individual is likely homozygous dominant. If roughly half of the offspring exhibit the recessive phenotype, the tested individual is likely heterozygous.
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