Final Review

A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

• Incomplete dominance

• Codominance

• Complete dominance

• Mendelian inheritance

What goes in box 3

• Aabb

• Abab

• AAbb

• aaBb

What is the genotype for a pea plant heterozygous for round seeds (R), and homozygous recessive for green seeds (y)?

• Ry

• RRyy

• RrYy

• Rryy

In the cross shown above, you can see that ​ (a)   (25 percent) has the genotype PP, one out of four (25 percent) has the genotype pp, and ​ (b)   (50 percent) have the genotype Pp. These percentages of genotypes are what you would expect in any cross between ​ (c)   Of course, when just four offspring are produced, the actual percentages of genotypes may vary by chance from the expected percentages. However, if you considered hundreds of such crosses and thousands of offspring, you would get very close to the expected results, just like tossing a coin.

• one out of four offspring
• two out of four
• two heterozygous parents.

A HETEROZYGOUS individual would have the genotype:

• Hh

• hh

• HH

• Hi

In pea plants, tall (T) plant alleles are dominant to short (t) plant alleles. If two tall plants (each with the genotype Tt) are crossed, what is the probability that the cross would result in a short pea plant?

• 25%

• 50%

• 75%

• 100%

the genetic makeup of an organism

• heterozygous

• punnet square

• genotype

Complete the Punnett square of the monohybrid cross Ss x Ss to show how often each genotype is expected to appear in four offspring (Underline the lowercase s).

What is the probability of heterozygous offspring?

• 25%
• 50%
• 0%
• 100%

What is the phenotype of a pea plant with the genotype Tt?

• Tall

• Short

• Medium

• Dwarf