Genetics Review

Two pink roses are crossed. ¼ of the flowers in the next generation are bright red. ¼ of the flowers in the next generation are white. ½ of the flowers in the next generation are pink. What type of inheritance does this situation represent?

• codominance

• incomplete dominance

• multiple alleles

• environmental influence

What is the probability of getting a wrinkled & green pea based on the Punnet square?

• 3/16 (~19%)

• 9/16 (~56%)

• 4/16 (25%)

• 1/16 (~6%)

What do Punnett squares NOT always show?

• the actual outcomes for the genetic crosses for each offspring.

• the possible genotypes of the offspring.

• the possible alleles in the gametes of each parent.

• all possible results of a genetic cross.

Which of the following is an example of a homozygous dominant genotype?

• Aa

• purple

• AA

• white

• aa

Which of the following is an example of a heterozygous genotype?

• Aa

• purple

• AA

• white

• aa

Which of the following is an example of a phenotype?

• Aa

• purple

• AA

• aa

Why are some diseases (like hemophilia or color blindness) so much more common in males?

• Some genes are located on the X chromosome and males only have one copy of the X chromosome so whatever allele they get is expressed.

• Some genes are located on the Y chromosome and males are the only ones with a Y chromosome so they are the only ones who can express the alleles.

• Some genes are located on the X chromosome and males have two X chromosomes so they need two copies of the allele in order for it to be expressed.

Who is considered the "father of genetics"?

• Gregor Mendel

• Nelson Mandela

• James Watson

• Charles Darwin

Which of the following crosses might produce a baby that has a phenotype that is different from both of its parents?

• RR x rr

• Rr x Rr

• rr x rr

• RR x RR

What term is used for traits that are influenced by many genes?

• linked genes

• Mendelian inheritance

• polygenic traits

• sex-linked traits