4. Which one of the following represents a test cross?
a )YYRR ~ yyrr
by YyRr x YyRr
c) YyRr x yyrr
d) YYRI X YYRR
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Test crosses are used to test an individual's genotype by crossing it with an individual of a known genotype. Individuals that show the recessive phenotype are known to have a homozygous recessive genotype. ... The purpose of a test cross is to determine if this individual is homozygous dominant or heterozygous.
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Answer: C.
Explanation:
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