Punnett Squares and Predictions

​Punnett Squares the Next Level.

Boss | Biology | 11-3-24

By Rebecca Boss

11-5 SBW Preview

Predictions and Punnett squares

Be able to interpret and predict genotypes from information given in Punnett squares

Some Review before building on new information

Multiple Choice

What you see, or the physical appearance.

• Genotype

• Homozygous

• Phenotype

• Heterozygous

Multiple Choice

The genes an organism has is known as its___________.

• Genotype

• Homozygous

• Phenotype

• Heterozygous

Multiple Choice

In a Punnett square what do the letters at the top or side of individual columns and rows represent?

• End results of a mitotic cell in the parent organisms

• Gametes that would be passed on by a single parent

• Random genes that are passed on to offspring

• They have no significance

Multiple Choice

Which genes are represented by a capital letter in Punnett squares?

• Wandering Genes

• Recessive Genes

• Dominant Genes

• Wearable Jeans

Multiple Choice

What genotype would go in box 4?

• BB

• Bb

• bb

• nothing

Multiple Choice

What genotype would go in box 2?

• BB

• Bb

• bb

• nothing

Making predictions

Just like we can determine potential genes for offspring of specific genetic crosses we can also use Punnett squares and genetics of offspring and their geno and phenotypes to make predictions about what genetics the parent organisms had.

Multiple Choice

In a situation where tall is a dominant trait. A tall pea plant and a short pea plant were bred together. All of the offspring were tall what would the potential genes of the parent plants be?

• TT x TT

• tt x tt

• Tt x tt

• TT x tt

Multiple Choice

Use the image and decide which of the crosses represents a breeding of parent organisms where the genetics of one parent is heterozygous and one is recessive.

• Cross 1

• Cross 2

• Cross 3

• Cross 4

• Cross 5

Multiple Choice

If you had 2 parent plants that were heterozygous for hair stems and they had 100 off spring what would be the chance that some of the offspring would have hairless stems?

• 100%

• 75%

• 50%

• 25%

Multiple Choice

If you had 2 parent plants where one plant is heterozygous for hair stems and the other is homozygous for hairless stems and they had 100 off spring what would be the chance that some of the offspring would have hairless stems?

• 100%

• 75%

• 50%

• 25%