Genetics Practice: Punnett Squares and Dominant vs. Recessive Traits, Summaries of Genetics

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Punnett Square

Practice

Use your clicker to choose the correct answer

Dominant vs. Recessive

Which trait is dominant? A. B B. b

Heterozygous

or

Homozygous

For each genotype, indicate

whether it is heterozygous

(hybrid) or homozygous

(purebred)

Rr

A) Heterozygous (hybrid) B) Homozygous (purebred)

DD

A) Heterozygous (hybrid) B) Homozygous (purebred)

Filling in a punnett square

and interpreting the results

For this set of questions fill in the punnett square or draw conclusions from the punnett square.

D

D

d

d

A) DD

B) Dd C) dd

G g

g

g

A)GG

B)Gg C)gg

In pea plants smooth seeds are dominant (S) to wrinkled seeds (s). What is the phenotype for a pea seed that is Ss? A) smooth B) wrinkled

In pea plants smooth seeds are dominant (S) to wrinkled seeds (s). What is the phenotype for a pea seed that is homozygous recessive (rr)? A) smooth B) wrinkled

A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR). What percentage of the offspring will be homozygous dominant(RR)? A) 4:4 100% B) 3:4 75% C) 2:4 50% D) 1:4 25%

In pea plants purple flowers are dominant (P) to white flowers (p). Two plant, both heterozygous (Pp) for the gene that controls flower color are crossed. What percentage of the offspring will have purple flowers? A) 1:4 25% B) 3:4 75% C) 4:4 100% D) 2:4 50%

A single gene carries ____ unit(s) of information. A. 1 B. 2 C. 3 D. 4

An inherited trait that is controlled by more than one gene pair is called a A.Gene B.Heredity C.Polygenetic trait D.Genetics