Which is a non-mendelian trait?
a. a trait with a very dominant form
b. a trait with two alleles c. a trait with no clearly dominant allele
d. a trait controlled by one gene

C. A trait with no clearly dominant allele

Explanation:

Polygeny is a non-Mendelian characteristic. Polygeny refers to the interaction of two or more pairs of genes that accumulate their effects, having a series of different and gradual phenotypes. These characteristics can also have a great influence of environmental factors, which further increases the variation of phenotypes. This type of inheritance explains, for example, the wide variety of skin tones present in the population. In this case, for example, it is not known for sure how many genes are involved, nor is it possible to recognize a clearly dominant allele.

d. planting trees

the trees take in carbon to make oxygen.