Aplants can have either brown (b) or red (b) leaves. brown is the dominant trait is a plane as a genotype bb which best describes the plant. a. homozygous with brown leaves. b. heterozygous with red leaves c. homozygous with red leaves. d. heterozygous with brown leaves

The correct answer is-  D. Heterozygous with brown leaves.

According to the information given in the question, brown leaves (depicted by 'B' allele) is a dominant trait over red leaves ( depicted by 'r' allele), which is a recessive trait.

A dominant trait ( depicted by capital letter allele) is the one that masks the expression of a recessive trait ( depicted by small letter allele).

There can be two possible genotypes for brown leaves that is BB ( homozygous dominant, as it is having both the dominant alleles) and Bb ( heterozygous dominant, as having two different alleles that is 'B' and 'b').

Thus, plant with genotype Bb can be said as Heterozygous ( having two different alleles) with brown leaves.