7th Grade Science Genetics

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200 200200200200

300 300 300 300 300

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500 500 500 500 500

Punnett Square

Punnett Square,

too!

___gous Do the Math

Hodge-podge

Punnett Square – 100

A four-sided tool used for predicting traits

Punnett Square

Punnett Square- 200

What’s the first step in solving the following problem?

If you cross a homozygous dominant purple pea plant with a heterozygous pea plant, what’s the probability of the

offspring being purple?

underline the important information

Punnett Square 300

After underlining, what’s the next step in solving the following problem?

If you cross a homozygous dominant purple pea plant with a heterozygous pea plant, what’s the probability of the offspring being purple?

Figure out what is dominant and what is recessive

Punnett Square 400

After figuring out what’s dominant and recessive, what’s the next step for solving the problem of:

If you cross a homozygous dominant purple pea plant with a heterozygous pea plant, what’s the probability of the offspring being purple?

Labeling for mom and dad or plant 1 or plant 2, etc.

Punnett Square- 500

What’s the last step before making the cross to complete a Punnett Square?

Place alleles (genotypes) on the top and side of the square

Punnett Square, Too!- 100

Cross a homozygous brown-eyed man with a homozygous brown-eyed woman. Brown is dominant. Use the letter ‘B’.

BB BB

BB BB

B B

B

B

Punnett Square, Too! - 200

Cross a heterozygous brown-eyed man with a blue-eyed

woman. Brown is dominant. Use the letter ‘B’.

Bb bb

Bb bb

B b

b

b

Punnett Square, Too!- 300

Cross a blue-eyed woman with a blue-eyed man. Use

the letter ‘B’.

bb bb

bb bb

b b

b

b

Punnett Square, Too!- 400

Cross a purebred purple pea plant with a hybrid pea

plant. Purple is dominant. Use the letter ‘P’

PP PP

Pp Pp

P P

P

p

Punnett Square, Too!- 500

Cross a heterozygous purple pea plant with a white pea plant. Purple is dominant.

Use the letter ‘P’

Pp pp

Pp pp

P p

p

p

_______gous – 100

Two alike alleles are known as

homozygous

_______gous - 200

A genotype with different alleles is known as

Heterozygous

______gous - 300

HH, for example

Homozygous dominant

______gous - 400

hh, for example

homozygous recessive

_____gous - 500

When two chromosomes on a chromatid are alike, it’s

called…..

homologous

Do the Math - 100

The likelihood that an event will occur

Probability

Do the Math - 200

What is the % probability of the offspring having a

heterozygous genotype?

0%

BB BB

BB BB

B B

B

B

Do the Math - 300

Brown is dominant. What is the % probability of the

offspring having a phenotype of brown eyes?

50% Bb bb

Bb bb

B b

b

b

Do the Math - 400

What is the % probability of the offspring being a hybrid?

50%

PP PP

Pp Pp

P P

P

p

Do the Math - 500

What is the probability of the offspring being a purebred?

Do not express it as a percentage.

1/2 or 1:2

PP PP

Pp Pp

P P

P

p

Hodgepodge - 100

Who is the “Father of Genetics”?

Gregor Mendel

Hodgepodge - 200

What is a pea pod?

The outermost casing which holds peas, the delicious

round vegetables, in place.

Hodgepodge - 300

When Gregor Mendel used only purebred pea plants in

his experiments, he was using the principal of:

Selective Breeding

Hodgepodge - 400

Yellow is recessive. For pea pods, which color would

show if you had two recessive alleles?

yellow

Hodgepodge - 500

What’s the probability of having a yellow pea pod when each parent has a homozygous dominant genotype? Green is

dominant

0%