A scientist studying a species of algae, Gracilaria domingensis, discovered that its color is controlled by a single gene with two alleles.  The individuals with a red or green phenotype are homozygous for the red or green alleles and the individuals with a brown phenotype are heterozygous.  The scientist crosses two brown individuals.  What percent of the offspring from this cross is predicted to be brown? A:  25% B:  50% C:  75% D: 100%

Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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A scientist studying a species of algae, Gracilaria domingensis, discovered that its color is controlled by a single gene with two alleles.  The individuals with a red or green phenotype are homozygous for the red or green alleles and the individuals with a brown phenotype are heterozygous.  The scientist crosses two brown individuals.  What percent of the offspring from this cross is predicted to be brown?

A:  25%
B:  50%
C:  75%
D: 100%

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Alleles can be described as the different forms associated with particular gene. The formation of gene forms generally occurs due to mutation. Inheritance of such alleles can be observed from one generation to next generation. The two general forms of inheritance include recessive and dominants. However, there are several other methods to inherit genes including codominance and incomplete dominance.

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