Name: ______Date: ______Period: ______

Station # 1

  1. Dogs

Dark brown fur is a dominant trait in dogs (D), and light brown fur is recessive (d).

1) A female dog is homozygous recessive for this trait. What is her genotype? ______

2) What is this female dog’s phenotype? ______

3) A male dog is heterozygous for this trait, what is his genotype? ______

4) What is the same male dog’s phenotype? ______

5) Complete the Punnett square: →

6) What are the chances their offspring will be dark brown?

______

7) What are the chances their offspring will be light fur?

______

B. Flowers

A florist noticed there was a species of flower with two unique phenotypes. Some of the flowers had pointed petals (B) and other flowers had rounded petals (b). The florist breeds two flowers; both have pointed petals, and create offspring. The offspring are planted and 8 weeks later all 3 offspring have rounded petals. Complete a Punnett square to show how this can happen.

8) In your own words explain how this can happen:

______

______

______

Station #2

  1. Eyes

In humans, brown eyes are dominant over blue. A brown-eyed man marries a blue-eyed woman and they have three children, two of whom are brown-eyed and one of whom is blue-eyed. Draw the Punnett square that illustrates this marriage in the space below.

What is the man’s genotype?______

What are the genotypes of the children? ______

B. Peas

Round peas are dominant over wrinkled peas.

Cross Rr x Rr

What percent are RR? ______

What percent are Rr? ______

What percent are rr? ______

What percent are round? ______

What percent are wrinkled? ______

Station #3

Use the computer to go to the site:

Go to the Single Gene Disorders section:

1)Name a disorder: ______

2) Explain what the disorder is:

______

______

______

3) List symptoms, treatments, or interesting facts of your disorder:

______

______

______

4) Go to the virtual DNA extraction lab and give it a try. Write down what you learned:

______

______

______

______

______

______

Station #4

  1. Tongues

Tom’s father was a homozygous dominant (purebred) tongue roller (TT)and his mother was heterozygous for tongue rolling (hybrid) (Tt). Show the genetic match in the Punnett Square below.

  1. What are the possible genotypes of the offspring? ______
  2. What is the chance of having a homozygous dominant offspring?______
  3. What is the chance of having a heterozygous offspring? ______
  4. What is the chance of having a homozygous recessive offspring? ______
  5. What is the chance of having an offspring with the ability to roll their tongue? ______
  6. What is the chance of having an offspring without the ability to roll their tongue? ______

B. Chickens

Co-Dominant Punnett Square

Cross an all black chicken (BB) with a black & white chicken (BW)

What % are all black? ______

What % are all white? ______

What % are black & white? ______

What % of the parents are homozygous? ______

What % of the parents are heterozygous? ______

What % of the offspring are homozygous? ______

What % of the offspring are heterozygous? ______

Station #5

  1. Make your own punnett square cross and answer the questions that follow.

______x ______

What are the possible genotypes of the offspring? ______

What is the chance of having a homozygous dominant offspring?______

What is the chance of having a heterozygous offspring? ______

What is the chance of having a homozygous recessive offspring? ______

What is the chance of having an offspring with the dominant trait? ______

What is the chance of having an offspring with the recessive trait? ______

B. Vocabulary Examples

Using the letter T, show the genotype

●Homozygous dominant - ______

●Heterozygous - ______

●Homozygous recessive - ______

Station #6

Visit the following website:

Complete the self-check quizzes for

Chapter 5: Heredity

-Section 1

-Section 2

-Section 3

Email results to

-use your student ID email