Question

In the chart, the organism Rr represents a genetically _____________ individual. A) heterozygous B) homogeneous C) homozygous D) retrozygous

Answer 1

R is a dominant allele and r is a recessive allele. For the organism to be a homozygous individual, it would have to be either RR or rr. Since the organism is Rr (both alleles), it is heterozygous.

You can remember the difference between homozygous and heterozygous by the words' prefixes:
- the prefix homo- means "same"
- the prefix hetero- means "different"

Answer 2

The organism Rr represents a genetically heterozygous individual.

GENOTYPE:

• The genotype of an organism refers to the genetic makeup of that organism. It constitutes the genes that determine the phenotype of such organism.

• For a specific gene, which is made up of alleles (different forms of a gene), one allele is dominant while the other is recessive in accordance to Mendel's law of dominance.

• When the gene of an organism contains two different alleles, the genotype is regarded as heterozygous while if it is the same allele, the organism's genotype is said to be homzygous.

• Therefore, an organism Rr, containing two alleles R and r, represents a genetically heterozygous individual.

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