T4L1: Genetics - Punnett Squares

Poll

Lately I feel like I'm....

• grumpier than normal.

• at peace.

Multiple Choice

Which of the following genotypes is homozygous dominant?

• A

• Aa

• AA

• aa

Multiple Choice

What you see, or the physical appearance.

• Genotype

• Phenotype

• Homozygous

• Heterozygous

Multiple Choice

Aa is

• homozygous

• heterozygous

Multiple Choice

Aa, DD, bB, yy are all examples of

• genotypes

• phenotypes

Multiple Choice

Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?

• 25%

• 1%

• 10%

• 0%

Multiple Choice

A chart that shows all the possible combinations of alleles that can result from a genetic cross

• dominant allele

• codominance

• probability

• Punnett Square

Multiple Choice

B = brown fur b = white fur

In the Punnett square, what is the probability for white fur?

• 0%

• 25%

• 50%

• 75%

Draw

In Mendel’s crosses, round was dominant. What is the phenotype of each of the following. 

Draw

Let’s practice assigning letters for the tall and short phenotype.   Remember, we usually use the letter of the dominant (trait).

Draw

In Guinea pigs, short hair is dominant over long hair. 

Draw

Show the cross between two heterozygous round plants

Draw

If you cross a round (Rr) plant with a wrinkled plant, what will the offspring be and in what proportion?

Draw

Consider a new cross.  This one will require you to think a little more about the genotypes of the parents.

Draw

Solve this one without given the steps. 

Multiple Choice

What ratio of the offspring from the cross shown will be homozygous recessive for the  trait of tallness? 

• 0 in 4

• 1 in 4

• 2 in 4

• 4 in 4

Multiple Choice

Which choice best represents the genotype of this cross?

• 1 Yy: 2 yy: 0 YY

• 2 Yy: 2 yy: 0 YY

• 3 Yy: 1 yy: 0 YY

• 1 Yy: 3 yy: 0 YY

Multiple Choice

When completing a Punnett Square, where are the genotypes of the parents?

• In the boxes

• On the top and side

• Nowhere

Multiple Choice

When completing a Punnett Square, where do we put the genotypes of the offspring?

• Inside the boxes

• On the top and side

• Nowwhere

Multiple Choice

What belongs in the last box?

• RR

• Rr

• rr

• ff

Multiple Choice

What is the genotype of the missing parent?

• BB

• Bb

• bb

Multiple Choice

What is the genotype for the black chickens?

• BB

• Bb

• bB

• bb