A 1:1 phenotypic ratio in a test cross indicated that

alleles are codominant

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dominant phenotype parent was heterozygous

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dominant phenotype parent was homozygous

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both parents were heterozygotes

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Solution

The correct option is B dominant phenotype parent was heterozygous
A testcross to a heterozygous individual should always yield about a 1:1 ratio of the dominant to recessive phenotype.
So, the correct option is 'dominant phenotype parent was heterozygous'

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A 1:1 phenotypic ratio in a test cross indicated that

The correct option is B dominant phenotype parent was heterozygousA testcross to a heterozygous individual should always yield about a 1:1 ratio of the dominant to recessive phenotype.So, the correct option is 'dominant phenotype parent was heterozygous'

The correct option is B dominant phenotype parent was heterozygous
A testcross to a heterozygous individual should always yield about a 1:1 ratio of the dominant to recessive phenotype.
So, the correct option is 'dominant phenotype parent was heterozygous'