Why is a testcross necessary to determine genotype when an organism shows a dominant trait?

a. phenotype has nothing to do with genotype.

b. an organism with a dominant trait will always have two dominant alleles.

c. an organism only needs one dominant allele to show the dominant trait.

d. testcrosses aren't required when dominant traits are present

Question

Marie Vincent

Biology

3 May, 20:51

Why is a testcross necessary to determine genotype when an organism shows a dominant trait?

a. phenotype has nothing to do with genotype.

b. an organism with a dominant trait will always have two dominant alleles.

c. an organism only needs one dominant allele to show the dominant trait.

d. testcrosses aren't required when dominant traits are present

+5

Answers (1)

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Landin Boone · Answer 1

C an organism only needs one dominant allele, so the genotype could be 2 dominant or 1 dominant 1 recessive and you could only find out using a testcross