Heredity Quiz

The father of modern genetics and heredity is considered to be:

• Gregor Mendel

• Charles Darwin

• James Watson

• Francis Crick

Which organism did Mendel use in his experiments to determine his laws of heredity?

• Human beings

• Lab mouse

• Pea plant

• Corn plant

An allele is:

• another word for a gene

• a homozygous genotype

• a heterozygous genotype

• one of several possible forms of a gene

Phenotype refers to the ______________________ of an individual.

• genetic makeup

• actual physical appearance

• recessive alleles

• None of the above

Which statement pertains to Mendel's law of segregation?

• Two alleles for each trait separate during meiosis.

• Homozygous organisms are called hybrids.

• Dominant traits are visible.

• Allele pairs are called a genotype.

An organism with the genotype DD for a trait is __. Select all that apply.

• dominant

• recessive

• homozygous

• heterozygous

Traits controlled by genes on the X chromosome are called sex-linked traits. In what individuals are recessive sex-linked traits more commonly expressed?

• females because they have two X chromosomes

• males because they have only one X chromosome

• females because they have no Y chromosome

• males because they have a Y chromosome

Human blood groups are determined by ____________. Select all that apply (there could be more than one correct answer).

• multiple alleles

• codominance

• incomplete dominance

• single alleles

The following picture represents what pattern of inheritance?

• Complete dominance
• Incomplete dominance
• Co-dominance
• Sex-linked inheritance

In the following Punnett Square, R represents red scales and B represents blue scales.  If scale type shows co-dominance in fish, what is the probability of each color in the offspring?

• 50% blue, 50% red and blue, 0% red
• 50% purple and 50% blue
• 100% red and blue
• 0% red, 0% blue, 100% red and blue