Test: MCAT Biology

1.

Assume that a trait is expressed according to the mechanism of complete dominance. Each gene contributes one of two possible alleles. Which of the following statements is true?

If two heterozygous organisms mate, 25% of the progeny will be homozygous

There are three possible phenotypes the organism can express

If two heterozygous organisms mate, 75% of the progeny will display the dominant phenotype

The genotype is the expressed trait of the individual

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