Question

How many copies of a recessive allele are needed for that trait to show up?


One or more


Two

Answer 1

For a recessive allele to express its trait, two copies are needed. This means an individual must be homozygous for the recessive allele (having two recessive alleles, one from each parent) for the trait to be visible. If an individual has only one recessive allele and one dominant allele, the dominant trait will be expressed instead. Therefore, the answer is **two**.