EOC review Genetic outcomes

When Mendel was experimenting with pea plant crosses, one of the traits that he examined was seed texture. The two phenotypes are smooth and wrinkled. The totals for his F2 generation were 5,474 smooth and 1,850 wrinkled seeds. Which probability ratio best predicts this outcome?

• 2:1

• 3:1

• 4:1

• 5:1

The gene for black fur (B) is dominant over the gene for white fur (b) in mice. A homozygous dominant female and a heterozygous male produce 200 offspring during their lifetime. Approximately how many offspring would be expected to be homozygous dominant?

• 25

• 50

• 100

• 200

What is the chance of two parents with blood types AB and O producing an offspring with blood type O?

• 0%

• 25%

• 50%

• 75%

Sickle cell anemia is an autosomal recessive disorder. If each parent carries one sickle cell allele, what are the chances that their child will have sickle cell anemia?

• no chance

• one in four

• two in four

• three in four

Fraternal twins may or may not share similar characteristics due to

• independent assortment.

• polygenic inheritance.

• incomplete dominance.

• multiple alleles.