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Qtr 4 Genetics Review 20-21

Total questions: 35

Worksheet time: 38mins

Name
Class
Date
1.

Why is DNA important?

a)

it is very small and very complicated

b)

it's in everything

c)

it contains the codes to make proteins for the body

d)

because we eat it every day for energy

2.

What is the name of the molecular compound that runs the human body?

a)

protein

b)

fats

c)

carbohydrates

3.

The number of human chromosomes in a sex cell (sperm & egg) is

a)

11

b)

12

c)

23

d)

46

4.

The number of human chromosomes in a non-sex cell is

a)

23

b)

46

c)

92

5.
Baker’s yeast is a tiny, single-celled fungus that makes bread dough rise and converts sugars in alcohol. This yeast reproduces by budding. As the small bud grows, it receives a copy of the parent’s nucleus. When the bud pinches off, the new cell is smaller than the parent cell but genetically identical  What type of reproduction is this?
a)
Asexual
b)
Sexual
6.

Redwood trees are the tallest and largest trees in the world. Like other conifer trees, the trees bear male and female cones (sperm & egg) that rely on the wind for pollination. What kind of reproduction is this?

a)

Asexual

b)

Sexual

7.
When comparing the offspring of sexually and asexually reproducing organisms, we would expect the genetic material (DNA) of the sexually reproducing organism to -
a)
contain fewer mutations
b)
be lesser in quantity
c)
be simpler overall
d)
show more variation
8.
What are some of the facts about asexual reproduction?
a)
Takes only one mate to reproduce and takes a longer time to reproduce
b)
Takes a shorter amount of time to reproduce and it takes two mates to reproduce
c)
Reproduces diverse offspring and takes a longer time to reproduce
d)
Takes only one mate to reproduce and takes a shorter time to reproduce
9.
Which of the following is homozygous dominant?
a)
Jj
b)
Rr
c)
MM
d)
ee
10.
How many letters does a genotype contain?
a)
1
b)
2
c)
3
d)
4
11.
Mark is heterozygous. If B is for brown hair, and b is for blonde hair, what is Mark's genotype?
a)
BB
b)
bb
c)
Bb
d)
bB
12.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
13.
How much of your DNA do you inherit from your mom?
a)
10%
b)
25%
c)
50%
d)
it varies
14.

A version or variation of a gene

a)

trait

b)

gene

c)

allele

d)

DNA

15.

What is the only genotype that will show a recessive trait?

a)

aa

b)

AA

c)

Aa

d)

aA

16.
T - tall and t = short
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
17.
B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 
a)
0%
b)
25%
c)
50%
d)
75%
18.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
19.
What is a dominant allele?
a)
A trait that is always shown (capital letter)
b)
A trait that can be hidden (lower case letter)
c)
Alleles that are the same
d)
Alleles that are different
20.
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
21.
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%
22.

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 PP?

a)

25%

b)

0%

c)

100%

d)

50%

23.

When one allele is not dominant over another, resulting in a blended phenotype for heterozygous offspring is considered....

a)

Incomplete Dominance

b)

Codominance

24.

When one allele is not dominant over the other, resulting in both traits expressed in a heterozygous individual.....

a)

Incomplete Dominance

b)

Codominance

25.

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


Cross two speckled flowers. Predict the phenotypes of the offspring.

a)

1 red, 2 speckled, 1 blue

b)

2 red, 2 blue

c)

2 blue, 2 speckled

d)

1 red, 1 speckled, 2 blue

26.

A red flowered plant (RR) is crossed with a white flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance. What percentage of the offspring will have red (RR) flowers?

a)

0%

b)

25%

c)

50%

d)

100%

27.
When we say that a woman is a carrier for a genetic disease or disorder it means that
a)
she has 1 gene, but not the disorder
b)
she has 2 genes for the disorder
c)
she can pass the gene only to male children
d)
she can pass the gene only to female children
28.
Why are men 16 times more likely to be color-blind than women?
a)
to be color-blind, you must have a Y chromosome
b)
to be color-blind, all of your X chromosomes must have the gene
c)
color-blindness is caused by testosterone
d)
color-blindness is caused by the same gene as baldness
29.
If a gene is found only on the X chromosome and not the Y chromosome, it is said to be 
a)
sex-linked trait
b)
polygenic trait
c)
codominant trait
d)
incomplete dominance trait
30.

Colorblindness is a sex-linked recessive trait. A colorblind woman marries a male with normal color vision. What is the percent chance of them having a color blind son? Hint: look at review sheet #26 for help with the genotypes.

a)

0%

b)

25%

c)

50%

d)

75%

31.
In a pedigree, what shape represents a male?
a)
circle
b)
square
c)
triangle
d)
diamond
32.

On a pedigree, what does an open circle represent?

a)

Not Affected Male

b)

Not Affected Female

c)

Affected Male

d)

Affected Female

33.

On a pedigree, what does a horizontal line between a square and a circle mean?

a)

They are siblings

b)

They are cousins

c)

They are married ("together")

d)

They are the children

34.

On a pedigree, what does a vertical line coming down from a square and circle that are connected by horizontal line indicate?

a)

They are cousins

b)

The children

c)

Aunts and Uncles

35.

This pedigree shows a dominant trait in a family. Predict the genotype of the mother in the first generation (at the very top of the pedigree)

a)

Rr

b)

rr

c)

RR

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