Free Printable Biology 1: Genetics and Punnett Squares

Worksheets

Biology 1: Genetics and Punnett Squares

Total questions: 30

Worksheet time: 21mins

Name

Class

Date

Which of the following alleles is homozygous (purebred) recessive?

Dominant alleles are represented by a:

Male gene

lowercase letter

recessive trait

capital letter

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

0 %

25%

50%

75%

Aa is

homozygous (purebred)

heterozygous (hybrid)

B=brown eyes
b= blue eyes
What is true about these two brothers that have brown eyes:
One has genotype BB the other Bb.

they have same phenotype and genotype

they have different genotypes and phenotypes

they have same phenotype but different genotypes

they have same genotype but different phenotypes

Evan is a tall, 12 year old boy. He has a scar on his right cheek. He is intelligent and an excellent drummer. Which of his traits did he most likely inherit?

height

the scar

his intelligence

ability to play drums

G = green, g = yellow
The genotype for a yellow plant is...

all of the choices result in yellow

T = tall an t = short
TT and Tt would result in the following phenotype

short

tall

medium sized

neither tall or short

the passing of genetic traits from parent to offspring.

heredity

trait

gene

allele

10.

Who is considered the "father of genetics"?

Gregor Mendel

Reginald Punnett

James Watson

Justin Bieber

11.

The scientific study of heredity is ____.

Genetics

Punnett squares

Inheritance

Biology

12.

How many alleles (letters) do each person carry for a trait?

13.

How many alleles (letters) does a child get from each parent for each trait?

14.

Having two of the same genes for the trait (TT, tt); Both dominant or both recessive.

homozygous or purebred

heterozygous or hybrid

twin offspring

pairs of chromosomes

15.

What are the three generations that were established by Mendel?

P, M, C

1, 2, 3

A, B₁, B₂

P, F₁, F₂

16.

____ is the likelihood that a specific event will occur.

Cross

Probability

Ratio

Independent assortment

17.

Aa, DD, bB, yy are all examples of

genotypes

phenotypes

18.

What you see, or the physical appearance.

Genotype

Phenotype

Homozygous

Heterozygous

19.

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

20.

aa always shows up as

dominant

recessive

21.

Which of the following genotypes is homozygous dominant?

22.

Which of the following genotypes is heterozygous?

23.

W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?

none

3/4

1/2

all

24.

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

25.

What are the different variations of a gene ?

mutation

genotype

phenotype

allele

26.

What does heterozygous mean?

the different forms of a trait (red hair, brown hair, etc)

when an organism has two of the same alleles for a trait (ex. RR)

when an organism has two different alleles for a trait (ex.Tt)

neither gene is dominant over the other and a blend of both traits appear in the offspring

27.

What are the letters Ss and example of ?

homozygous genes

domianant genes

heterozygous genes

recessive genes

28.

What goes in the missing square?

29.

A homozygous dominant chicken with black fur is crossed with a heterozygous chicken with black fur. What are the percentages of the possible genotypes?

50% BB and 50% Bb

25% BB and 75%Bb

75% BB and 25% Bb

100% BB

30.

Long tails in monkeys (L) is dominant to short tails (l). What are the percentages of genotypes if you cross a homozygous dominant monkey with a homozygous recessive monkey.

50% LL 50% ll

50% LL and 50% Ll

75% LL and 25% Ll

100% Ll

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Biology 1: Genetics and Punnett Squares

Total questions: 30

Worksheet time: 21mins

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