Question

Which of the following is true about a plant with the genotype AABbcc? It is homozygous at two gene loci. (Look up "loci" if needed.) It is heterozygous at two gene loci. (Look up "loci" if needed.) It has recessive alleles at three gene loci. (Look up "loci" if needed.) It will not express the recessive cc alleles.

Answer 1

Answer:

It is homozygous at two gene loci.

Explanation:

An organism may be homozygous or heterozygous for a particular gene. The presence of two identical alleles of a gene in the genome of an organism makes it homozygous for the gene. On the other hand, the presence of two dissimilar alleles of a gene makes the organism heterozygous for the gene.

For instance, AA or aa are homozygous states since two copies of identical alleles (dominant and recessive respectively) are present. The genotype "Aa" is heterozygous since it has one dominant and one recessive allele for a particular gene.

The given genotype "AABbcc" is homozygous for "A" and "c" due to the presence of two copies of dominant and recessive alleles respectively. However, it is heterozygous for the second loci (Bb). Since the recessive allele is present in the homozygous state (cc), it will express itself.