2024 Genotype vs Phenotype

What is the recessive allele?

• An allele that expresses its trait only when two copies are present (e.g., e in ee).

• An allele that always expresses its trait regardless of the other allele present.

• An allele that can mask the expression of another allele.

• An allele that is only found in males.

What is a genotype?

• A genotype is the physical appearance of an organism.

• A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., AA, Aa, aa).

• A genotype refers to the environmental factors affecting an organism.

• A genotype is the process by which traits are passed from parents to offspring.

If a person has a smooth chin, what must their genotype be?

• EE (homozygous dominant)

• Ee (heterozygous)

• ee (homozygous recessive)

• Ee (homozygous dominant)

What does heterozygous mean?

• Having two identical alleles for a particular gene (e.g., AA)

• Having two different alleles for a particular gene (e.g., Aa)

• Having one allele for a gene and no allele for another

• Having three alleles for a particular gene (e.g., AAB)

What is the relationship between genotype and phenotype?

• The phenotype determines the genotype.

• The genotype determines the phenotype, as it provides the genetic instructions for the traits expressed.

• Genotype and phenotype are unrelated concepts.

• Phenotype is a result of environmental factors only.

What is the dominant allele?

• An allele that expresses its trait only when two copies are present (e.g., ee).

• An allele that expresses its trait even when only one copy is present (e.g., E in Ee).

• An allele that does not express its trait at all (e.g., e in Ee).

• An allele that can only be expressed in the presence of a recessive allele.

What is the purpose of a Punnett square?

• To predict the possible genotypes and phenotypes of offspring from a genetic cross.

• To determine the exact number of offspring produced in a genetic cross.

• To analyze the physical traits of an organism without genetic information.

• To create a visual representation of all possible genetic combinations in a population.

How can you identify a heterozygous genotype?

• By the presence of two identical alleles for a gene, such as AA

• By the presence of two different alleles for a gene, such as Aa

• By the presence of three different alleles for a gene, such as ABC

• By the absence of any alleles for a gene, such as --

What is the genotype for straight hair?

• HH (homozygous dominant)

• Hh (heterozygous)

• hh (homozygous recessive)

• Hh (homozygous dominant)

What is a phenotype?

• The genetic makeup of an organism.

• The physical appearance or observable traits of an organism, resulting from the interaction of its genotype with the environment.

• The process by which organisms adapt to their environment.

• The study of heredity and the variation of inherited characteristics.