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Genetics Review

Total questions: 50

Worksheet time: 40mins

Name
Class
Date
1.
An organism's phenotype describes its __________.
a)
genetic makeup
b)
physical appearance
2.
What do you call a section of DNA that codes for a specific trait?
a)
nucleus
b)
chromosome
c)
gene
d)
DNA
3.
__________ worked with pea plants to prove that traits are passed from parent to offspring.
a)
Reginald Punnett
b)
Gregor Mendel
4.
A recessive trait only shows up when __________.
a)
two dominant alleles are present
b)
one dominant allele is present
c)
two recessive alleles are present
d)
at least one dominant allele is present
5.
If you cross two parents, both with genotype Bb, what percentage of children will have brown eyes?
a)
25%
b)
50%
c)
75%
d)
100%
6.
Purebred is another word for __________, while hybrid is another word for __________.
a)
dominant; recessive
b)
recessive; dominant
c)
homozygous; heterozygous
d)
heterozygous; homozygous
7.
The two different forms of a gene are called _________.
a)
zygotes
b)
traits
c)
phenotypes
d)
alleles
8.
What word describes how traits are passed from parent to offspring?
a)
Alleles
b)
Dominance
c)
Probability
d)
Heredity
9.
Plant height is T = tall and t = short. Flower color is P = purple and p = white. Which genotype is NOT possible for a tall plant with purple flowers?
a)
TtPp
b)
TTPP
c)
TTPp
d)
ttpp
10.
Scientists use __________ to show what genotype combinations are possible.
a)
Punnett Square
b)
Mendel Square
c)
Madison Square
d)
Times Square
11.
What is the phenotype in the bottom right square? (Yellow is dominant and green is recessive)
a)
yy
b)
Yy
c)
yellow
d)
green
12.
Which of the following is the genotype for a homozygous recessive trait?
a)
gg
b)
Gg
c)
GG
13.
What % of the offspring in the Punnet square are heterozygous?
a)
25%
b)
50%
c)
75%
d)
100%
14.
What type of letters are used to show a trait is dominant?
a)
capital
b)
lowercase
15.
What are traits that aren't dominant over each other but whose heterozygous outcome is a combination of the two equally but separately?
a)
pure dominance
b)
incomplete dominance
c)
co-dominance
d)
simple dominance
16.
What is the type of dominance when the two traits aren't dominant over each other, but whose heterozygous outcome is blended?
a)
co-dominance
b)
simple dominance
c)
incomplete dominance
d)
non-dominance
17.
PP is what type of genotype?
a)
homozygous recessive
b)
heterozygous recessive
c)
homozygous dominant
d)
homozygous recessive
18.
Pp is an example what type of genotype?
a)
homozygous recessive
b)
homozygous dominant
c)
heterozygous dominant
19.
What type of letter show s a recessive trait?
a)
capital
b)
lowercase
20.
What is the study of heredity?
a)
genetics
b)
cell biology
c)
chemistry
d)
botany
21.
Who was the father of genetics?
a)
Mendel
b)
Einstein
c)
Redi
d)
Pasteur
22.
What is a trait that will always show itself?
a)
recessive
b)
dominant
c)
one from the dad
d)
one from the mom
23.
This is the physical appearance of a trait.
a)
genotype
b)
phenotype
24.
If there is a cross of a red and white chicken, and the trait is co-dominant, what will be the result?
a)
a blended color
b)
a speckled chicken
25.
If red and white have incomplete dominance for a trait, and a red flower is crossed with  a white flower, what will be the result?
a)
a spoted flower
b)
a blended flower
26.
Punnett squares can be used to predict the probability of:
a)
being exposed to a contagious disease and contracting it
b)
having an inherited disease or a genetically determined physical trait
c)
Both
27.
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?
a)
25%
b)
0%
c)
100%
d)
50%
28.
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 white?
a)
25%
b)
0%
c)
100%
d)
50%
29.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
30.
In the punnett square shown, what is the genotypes of the two parents?
a)
RW and RR
b)
RW and WW
c)
RR and WW
d)
RW and RR
31.
This image shows a...
a)
Punnett Square
b)
Phenotype
c)
Genotype
d)
Dominant allele
32.

In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?

a)

0%

b)

25%

c)

50%

d)

75%

33.

Each one of the boxes on the Punnett square represents what probability of an offspring's genotype?

a)

25%

b)

1%

c)

10%

d)

0%

34.
In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?
a)
Tall = T
Short = S
b)
Tall = T
Short = t
c)
Tall = t
Short = T
d)
Tall = TT
Short = tt
35.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
25%
c)
50%
d)
75%
36.
What is the probability of a purple-horned unicorn if a heterozygous pink-horned unicorn is crossed with a heterozygous pink-horned unicorn?
a)
0%
b)
25%
c)
50%
d)
75%
37.

Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).


Cross a red flower with a speckled flower. What is the phenotypic ratio?

a)

2 red, 2 speckled

b)

2 red, 2 blue

c)

2 blue, 2 speckled

38.

Radish color is completely dominant, red and white are pure breeding colors. While heterozygous are purple.


Cros a red radish with a purple.

a)

4 purple

b)

1 red, 2 purple, 1 white

c)

2 red, 2 purple

d)

1 red, 1 purple, 2 white

39.

In cattle red coats are represented as RR, and white coats are represented as WW.


What is the genotype for Roan color?

a)

RR

b)

RW

c)

WW

40.

What are the 4 possible phenotypes for human blood type?

a)

Type A

b)

Type B

c)

Type BB

d)

Type AB

e)

Type O

41.

If a person has type B blood, the phenotype is B. What can the genotype be?

a)

IBIB or IBi

b)

IAIA or IAi

c)

IAIB

d)

ii

42.

If a person has type AB blood, the phenotype is AB. What can the genotype be?

a)

IBIB or IBi

b)

IAIA or IAi

c)

IAIB

d)

ii

43.

if the father is type A and the mother is type B, in order for baby Sylvester to have the genotype ii, his parents must be?

a)

heterozygous

b)

homozygous

44.

There are multiple alleles for the ABO blood group. Why are only two of these alleles present in any one individual?

a)

Each parent contributes only one allele for the ABO blood group to the offspring.

b)

There are not enough nucleotides in a red blood cell to produce a third allele.

c)

Each allele in the ABO group must be dominant or recessive

d)

Blood group alleles are not segregated during meiosis.

45.

The sex of a child is determined by:

a)

Whether the father's sperm contains an X or Y chromosome

b)

Whether the mother's egg contains an X or Y chromosome

c)

The age of the parents

d)

The presence or absence of proteins in the mother's womb

46.

Males are more likely to suffer from a sex-linked disease or disorder because:

a)

Males have more testosterone

b)

Males have less DNA

c)

Males have 1 X chromosome, so the disorder is more likely to be expressed

d)

Females have 1 Y chromosome to mask the trait

47.

If a gene is found only on the X chromosome and not the Y chromosome, it is said to be a:

a)

Sex-linked trait

b)

Polygenic trait

c)

Co-dominant trait

d)

Incomplete dominance trait

48.

Hemophilia is a recessive x-linked disorder.

Which genotype represents a female who is a carrier for hemophilia?

a)

XXh

b)

XhXh

c)

XX

d)

XhY

49.

The woman who is colorblind marries a man with normal vision. What is the probability that their sons will be colorblind?

a)

0%

b)

25%

c)

50%

d)

100%

50.

Which of the following is TRUE?

a)

Sex chromosomes determine gender

b)

Males have XY; Females have XX

c)

Non-sex chromosomes are called autosomes

d)

All of these

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