A plant possesses two different alleles (T and t) for the gene controlling stem height. Wh… — JAMB UTME

A plant possesses two different alleles ( $T$ and $t$ ) for the gene controlling stem height. Which of the following statements correctly identifies the genetic condition, genotype, and phenotype of this plant?

The plant is heterozygous with a genotype of $Tt$ and displays a tall phenotype.Answer
B
The plant is homozygous dominant with a genotype of $TT$ and displays a tall phenotype.
C
The plant is heterozygous with a phenotype of $Tt$ and displays a tall genotype.
D
The plant exhibits codominance with a genotype of $Tt$ resulting in an intermediate height phenotype.

Answer

The plant is heterozygous with a genotype of

Tt

and displays a tall phenotype.

Having two different alleles (

T

and

t

) defines the heterozygous condition. The exact combination of alleles (

Tt

) represents the genotype, while the expressed physical characteristic (tall) represents the phenotype under complete dominance.

Step-by-Step Solution

Identify the allele composition of the plant.

The plant possesses two non-identical alleles (

T

for tallness and

t

for dwarfness).

An individual carrying two different alleles at a specific gene locus is defined as heterozygous.

Determine the genotype.

The genotype is expressed as

Tt

Genotype refers to the specific genetic makeup or combination of alleles of an organism.

Determine the phenotype under complete dominance.

The phenotype is tall.

Phenotype refers to the observable physical trait. Because the dominant allele (

T

) completely masks the expression of the recessive allele (

t

), the expressed physical appearance is tall.

Key Concept

Heterozygous genotype versus physical phenotype in complete dominance

Estimated Time:1m 0s

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Key Concept

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