AP Biologyeasymcq1 pt
A test cross is used to determine
A.whether a dominant phenotype is homozygous or heterozygous
B.the chromosome number of a species
C.whether a trait is polygenic
D.the sex of offspring
Explanation
Core Concept
Crossing the unknown with a homozygous recessive reveals its genotype: any recessive offspring prove the parent carried the recessive allele.
Correct Answer
Awhether a dominant phenotype is homozygous or heterozygous
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