Unit 9: Genetics Quiz Review

An allele is:

• what the organism looks like

• a homozygous genotype

• a heterozygous genotype

• one of several possible forms of a gene

What is a punnett square used for?

• Determine the possible outcomes of a cross

• Find the actual outcome of a cross

• Show incomplete dominance

• Show meiosis

An organism’s physical appearance is its

• Genotype.

• Phenotype.

• Codominance.

• Heterozygous.

Which of the following shows a homozygous recessive individual?

• Tt

• TT

• tt

• tT

Which of the following is a heterozygous individual?

• TT

• Tt

• tt

• TH

If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?

• 25 percent

• 50 percent

• 75 percent

• 100 percent

How does a geneticist use pedigrees?

• to create genetic crosses

• to replicate identical strings of DNA

• to prove that sex-linked traits are caused by codominant alleles

• to trace the inheritance of traits over generations of families

What is a pedigree?

• chart that tracks which members of a family have a particular trait

• geneticist who studies the inheritance of traits in humans

• a picture of all of the chromosomes in a cell

• an allele passed from parent to child on a sex chromosome

Who is considered the "father" of modern genetics?

• Einstein

• Mendel

• Disney

• Washington

Y for yellow body is dominant over y for blue body. What alleles would produce yellow bodies?

• YY,yy

• Yy,yy

• YY only

• YY,Yy