Questions: Unit 4 Quiz 3 Revised Biology - Integrated - A - Premier - 2425 / Unit 4 - Genetics-Heredily Revised Premier 2425 1. Choose ALL answers that are true. (tt is possible that only one answer is true) For a recessive trait to be seen, one allele needs to be recessive both alleles need to be dominant one allele needs to be dominant both alleles need to be recessive

The correct answer is: both alleles need to be recessive.

Explanation for each option:

• One allele needs to be recessive: This is incorrect. For a recessive trait to be expressed, both alleles must be recessive. Having only one recessive allele would result in the dominant trait being expressed.

• Both alleles need to be dominant: This is incorrect. If both alleles are dominant, the dominant trait will be expressed, not the recessive trait.

• One allele needs to be dominant: This is incorrect. If there is one dominant allele, the dominant trait will be expressed, masking the recessive trait.

• Both alleles need to be recessive: This is correct. A recessive trait is only expressed when an individual has two recessive alleles for that trait.

In summary, for a recessive trait to be seen, both alleles need to be recessive.