10 points

a recessive trait is observed when an organism has recessive genetic factors

a 0
b 1
c 2
d 3

A recessive trait is observed when an organism has 2 recessive genetic factor

Option C

Explanation:

According to the Mendel’s law of inheritance there are two traits. Dominant and recessive. Usually the recessive are submissive genes which cannot express their characteristics. The dominant trait are the ones which expresses the characteristics.

Two copies of recessive allele are required for the recessive trait to be produced. The recessive trait will be expressed by each parent contributing one allele towards the offspring.

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.