Intro to Punnett Squares Accelerated

Introduction to Punnett Squares

​Punnett Squares

​Punnett squares are used to make predictions about which traits offspring will get from their parents.

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​It is important to remember that Punnett squares are theoretical; they show us the probability of offspring inheriting a particular trait. The proportions predicted using Punnett squares may or may not happen in any particular family.

Video Section 1

Watch the following video segment by clicking on it on the next slide, and then answer the questions.

Multiple Choice

Hairlessness in guinea pigs is a __________ trait.

• dominant

• recessive

Multiple Select

In the hairless guinea pig scenario, the capital letter H represents (choose all that apply).

• the dominant allele

• the recessive allele

• hair

• no hair

Multiple Choice

A hairless guinea pig has two recessive alleles.

• True

• False

Video Section 2

Watch the following video segment by clicking on it on the next slide, and then answer the questions.

Multiple Select

The genotype(s) for guinea pigs with hair is/are

• HH

• Hh

• hh

Multiple Select

The genotype(s) for a hairless guinea pig is/are (choose all that apply)

• HH

• Hh

• hh

Multiple Select

Which genotype(s) is/are homozygous? (choose all that apply)

• HH

• Hh

• hh

Multiple Select

Which genotype(s) is/are heterozygous? (choose all that apply)

• HH

• Hh

• hh

Video Section 3

Watch the following video segment by clicking on it on the next slide, and then answer the questions.

Multiple Choice

The correct way to write a heterozygous genotype is

• Hh

• hH

Multiple Choice

How many traits are examined in a monohybrid cross?

• 0

• 1

• 2

• 3

Multiple Choice

When two heterozygous parents are crossed, what portion of the offspring will have the recessive trait?

• 0%

• 25%

• 50%

• 75%

• 100%

Video Section 4

Watch the following video segment by clicking on it on the next slide, and then answer the questions.

Multiple Choice

Can Punnett squares guarantee the outcome of a particular cross?

• Yes, absolutely!

• No, they provide a prediction of what is likely to happen