Question 1: B. A genome is the haploid set of chromosomes in a gamete, microorganism, or each cell of a multicellular organism.
Question 2: D. The combination of alleles an individual has for a specific gene is their genotype.
Question 3: A. A diploid organism either inherits two copies of the same allele or one copy of two different alleles from their parents. If an individual inherits two different alleles, their genotype is classed as heterozygous for that locus.