Answer:
b. form of a gene
Explanation:
An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Genotypes are described as homozygous if there are two identical alleles at a particular locus and as heterozygous if the two alleles differ.
I think c is the answer not sure though
Two kinds of Fermentation are, Alcoholic and Lactic acid Fermentation.

The designation Rr for a pea-plant's peas shows that the plant is a <u>true-breeding plant</u>.