Genetics Quiz

What is a gene?

• A) A mathematical way to determine the probability of offspring

• B) The observable characteristics of an organism

• C) Section or segment of DNA in a specific location of the chromosome that codes for certain traits

• D) A genotype with two of the same alleles

What does a Punnett square help to determine?

• A) The genotype of an organism

• B) The probability of offspring having certain traits

• C) The observable characteristics of an organism

• D) The complete set of chromosomes in an organism

What does the term "homozygous" refer to?

• A) Genotype with one dominant allele and one recessive allele

• B) Genotype with two of the same alleles

• C) Two dominant traits are expressed equally in a trait

• D) A trait located on a sex chromosome

How is a dominant allele represented in a genotype?

• A) By two lowercase letters

• B) By two capital letters

• C) By one capital letter and one lowercase letter

• D) Not represented in the genotype

What is the difference between codominance and incomplete dominance?

• A) Codominance shows both traits equally, while incomplete dominance shows a blend of traits

• B) Codominance shows a blend of traits, while incomplete dominance shows both traits equally

• C) Codominance is related to sex chromosomes, while incomplete dominance is not

• D) There is no difference; they are the same

What is a karyotype?

• A) A chart that shows the occurrence & appearance of traits in an organism & its ancestors

• B) A genotype with two of the same alleles

• C) A photograph of a complete set of chromosomes in an organism

• D) A mathematical way to determine the probability of offspring

What pattern of inheritance is shown by the blue and yellow creatures where both colors appear simultaneously in the offspring?

• Incomplete dominance

• Codominance

• Complete dominance

• Multiple alleles

What pattern of inheritance is shown by the green creature, which is a blend of blue and yellow?

• Incomplete dominance

• Codominance

• Complete dominance

• Multiple alleles

Based on the diagram, what is the genotype of the green creature?

• BB

• YY

• BY

• None of the above

Which genotype represents a creature that is purely yellow?

• BB

• YY

• BY

• None of the above