Question

A human that possesses the paternal chromosome 9 and the maternal chromosome 9, and is otherwise normal exhibits

a) Normal phenotype
b) Recessive phenotype
c) Dominant phenotype
d) Mutant phenotype

Answer 1

A human with both a paternal and maternal chromosome 9 will typically exhibit a normal phenotype if there are no genetic abnormalities. The observable traits of an organism are referred to as its phenotype, which is influenced by the individual's genotype and environmental interactions. The correct option is a).

Step-by-step explanation:

In human genetics, having both a paternal and a maternal chromosome 9 means that the person has inherited one set of chromosome 9 from each parent, which is normal.

Therefore, if there are no other genetic abnormalities, this person would exhibit a normal phenotype, assuming that the genes on these chromosomes are also normal. Phenotype refers to the observable traits of an organism, determined by the interaction of its genetic makeup (genotype) and the environment.

A recessive trait is one that is expressed in the phenotype only when an individual is homozygous recessive (possessing two copies of the recessive allele).

In contrast, a dominant trait will be expressed when at least one dominant allele is present. Individuals who are heterozygous (possessing one dominant and one recessive allele) for a trait will also exhibit the dominant trait in their phenotype. Option a) is the correct one.