Genetics

What does it mean for an allele to be dominant?

• A dominant allele is one that expresses its trait even when only one copy is present in the genotype.

• A dominant allele is one that requires two copies to express its trait.

• A dominant allele is one that is always more common in a population than recessive alleles.

• A dominant allele is one that can only express its trait in the presence of a recessive allele.

What is the term for having two of the same genes for a trait?

• homozygous

• heterozygous

• dominant

• recessive

What does incomplete dominance mean in genetics?

• Traits are completely dominant over others.

• Traits are blended.

• Traits are expressed equally.

• Traits are suppressed by recessive alleles.

What is the principle of segregation in genetics?

• The principle of segregation states that during the formation of gametes, the two alleles for a trait separate from each other.

• The principle of segregation states that alleles for different traits are inherited independently of each other.

• The principle of segregation states that dominant alleles will always mask recessive alleles in offspring.

• The principle of segregation states that traits are inherited in a blended manner from both parents.

What is a genotype?

• A genotype is the genetic constitution of an individual, specifically the alleles present for a particular gene.

• A genotype refers to the observable characteristics of an individual.

• A genotype is the physical appearance resulting from the interaction of genes.

• A genotype is a type of genetic mutation that occurs in a population.

What does it mean for an allele to be recessive?

• A recessive allele expresses its trait regardless of the other allele present.

• A recessive allele only expresses its trait when two copies are present in the genotype.

• A recessive allele is always dominant over other alleles.

• A recessive allele can never be expressed in the phenotype.

Why are there no white rabbit babies in a population?

• Because white rabbits are not part of the population.

• Because it takes two recessive genes to show the trait.

• Because white rabbits are always outnumbered by other colors.

• Because the environment does not support white rabbit babies.

In pea plants, if the tall allele is dominant to the short allele, how are they represented?

• Tall is represented as T and short as t.

• Tall is represented as T and short as S.

• Tall is represented as T and short as r.

• Tall is represented as T and short as p.

What is the purpose of a Punnett square?

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

• To determine the age of an organism.

• To measure the height of plants in a garden.

• To analyze the behavior of animals in their habitat.

What is a phenotype?

• The genetic makeup of an organism.

• The observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.

• The process of natural selection acting on a population.

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