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

Biology

Grizzly

15 June, 13:29

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

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Answers (1)

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Ashanti Downs · 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