Punnett Square CFU Prep

Presentation

•

Biology

•

7th Grade

•

Medium

•

NGSS

HS-LS3-1, HS-LS3-2, HS-LS3-3

Standards-aligned

Heather Ziemba

Used 3+ times

FREE Resource

5 Slides • 26 Questions

Punnett Squares

CFU Prep

Phenotype

The combination of alleles you have for a trait.
EXAMPLES: two recessive alleles, AA, heterozygous

Genotype

Genotypes code for phenotypes.

The physical, observable trait.
EXAMPLES: blue eyes, freckles, green skin, red fur

Multiple Choice

Aa, DD, bB, yy are all examples of

genotypes

phenotypes

Multiple Choice

What you see, or the physical appearance.

Genotype

Phenotype

Homozygous

Heterozygous

Multiple Choice

Which statement best supports why many offspring look similar to their parents?

Offspring inherit characteristics from one parent.

Offspring inherit characteristics from both parents.

Parents choose which characteristics to pass on to their offspring.

Parents choose to change their appearance to match that of their offspring.

Multiple Choice

What is a phenotype?

The expression of a trait; physical appearance.

refers to the genetic makeup of an individual

An organism that has the same genes for a trait (ex. TT or tt)

the passing of traits from parent to offspring

Always expressed
Can be expressed even when only one copy is passed down from a parent.
Heterozygotes show this trait

Dominant Alleles

Recessive Alleles

Allele = version of a gene

Only expressed when the dominant allele is absent.
Needs to be passed down by both parents for the trait to show.
Masked, or hidden, in heterozygotes.

HOMOZYGOUS = both alleles are the same.
HETEROZYGOUS = both alleles are different.

Types of

Genotypes

Multiple Choice

In pea plants, round seeds (R) are dominant to wrinkled seeds (r). Which of the following represents the genotype of a pea plant that is heterozygous?

round

wrinkled

Multiple Choice

In pea plants, round seeds (R) are dominant to wrinkled seeds (r). Which of the following represents the genotype of a pea plant that is homozygous dominant?

round

wrinkled

Multiple Choice

If black fur is dominant and white fur is recessive, what genotype would an organism with white fur have?

Multiple Choice

Which of the following genotypes is homozygous dominant?

Multiple Choice

Homozygous recessive

Multiple Choice

Which of the following genotypes is heterozygous?

Multiple Choice

When the allele combination is a dominate and a recessive trait together which trait will be seen?

Dominate

Recessive

none

both

Multiple Choice

Different versions of a trait (tall or short, white or purple) are called

alleles

traits

versions

genes

Multiple Choice

In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?

RR or Rr

Parents go on the top and right side (purple boxes).
Offspring are in the middle (teal boxes), and take one allele from each parent.
Each box represents 25% or 1/4 probability.

Punnet Squares are models used to predict the genotypes and phenotypes of offspring based off the parent's genotypes.

The parents in this example are heterozygous (Bb) and have big beaks.

Possible Genotypes: 25% BB, 50% Bb, 25% bb

Possible Phenotypes: 75% big beaks, 25% small beaks

Multiple Choice

How is the Punnett Square set up?

Parents genotypes on the inside and offspring is on the outside

The genotypes of each parent are on the sides and the offspring is in the boxes

Grandparents genotypes on the sides and offspring in the box

Multiple Choice

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

25%

10%

Multiple Choice

T - tall and t = short
In the punnett square below, what belongs in the missing square

Multiple Choice

What allele combination should go in the missing box?

none of these

Multiple Choice

In mice, black fur (B) is dominant to white fur (b). According to the Punnett square shown, the offspring in box 4 would:

be white.

be heterozygous.

be gray.

be homozygous.

Multiple Choice

T - tall and t = short
In the punnett square below, what belongs in the missing square

Multiple Choice

What are the possible phenotype(s) of the offspring? (A-Brown hair; a-blond hair)

50 % Brown Hair and 50% Blond Hair

25 % Brown Hair and 75% Blond Hair

75 % Brown Hair and 25% Blond Hair

0% Brown Hair and 100% Blond Hair

Multiple Choice

A green pea plant (Gg) is crossed with a yellow pea plant (gg). Describe the genotype of the offspring.

50% heterozygous and 25% homozygous recessive

50% heterozygous and 50% homozygous recessive

100% homozygous recessive

25% heterozygous and 50% homozygous

Multiple Choice

Brown eyes are dominant over blue eyes. What is the probability that the offspring will have brown eyes in this cross?

25%

50%

75%

100%

Multiple Choice

In the punnett square shown, what must the genotype of the missing parent be?

Multiple Choice

In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being purple?

25%

100%

50%

Multiple Choice

In plants, tall (T) is dominant to short (t). Draw a punnett square and perform the following cross: Tt x Tt

What is the probability of producing a short plant?

25%

50%

75%

Multiple Choice

What genotype would go in box 2? And is it Homozygous or Heterozygous?

BB Heterozygous

Bb Heterozygous

bb Homozygous

Bb Homozygous

Punnett Squares

CFU Prep

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