Can someone help me with this test please??

R masks —or covers— r, so it only needs one copy to express its phenotype. This means it is the dominant allele.

Explanation:

In genetics, alleles are the members of an allelic pair that contain the genetic information related to a specific characteristic.

The dominant allele is one whose presence is sufficient to mask the expression of a recessive allele, so the phenotype shown is the dominant one.

A recessive allele needs to be present in both components of the allele pair in order to be expressed in the phenotype.

a. the production of carbon dioxide through the process of photosynthesis