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Genetics Unit Practice

Total questions: 38

Worksheet time: 19mins

Name
Class
Date
1.

When is your unit exam?

a)

MONDAY

b)

FRIDAY

2.

When you cross two heterozygous organisms what is the probability that the offspring will show the dominant phenotype?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

3.

___________________ is the godfather of genetics.

a)

Waltz

b)

Abner

c)

Hood

d)

Mendel

4.

In the genotype, the capital letter stands for the ____________________ allele.

a)

recessive

b)

dominant

c)

heterozygous

d)

homozygous

5.

___________________ is the godfather of genetics.

a)

Waltz

b)

Abner

c)

Hood

d)

Mendel

6.

the allele that always shows up & hides the weaker allele

a)

dominant

b)

recessive

c)

heterozygous

d)

homozygous

7.

Organisms outward appearance

a)

Genotype

b)

Phenotype

c)

Homozygous

d)

Heterozygous

8.

When the offspring inherits two different alleles

a)

Homozygous

b)

Heterozygous

c)

Genotype

d)

Phenotype

9.

When the offspring inherits two identical dominant alleles

a)

Homozygous

b)

Heterozygous

c)

Genotype

d)

Phenotype

10.

Combination of letters that represents an organisms genetic makeup

a)

Genotype

b)

Phenotype

c)

Homozygous

d)

Heterozygous

11.

Chart used to organize all possible combinations of offspring

a)

Homozygous

b)

Heterozygous

c)

Dominant

d)

Punnett Square

12.

Characteristic of an organism that makes it unique

a)

Trait

b)

Heredity

c)

Genetics

d)

Allele

13.

the allele that is always masked in the presence of the stronger

a)

dominant

b)

recessive

c)

heterozygous

d)

homozygous

14.

when the offspring inherits two identical recessive alleles

a)

black fur

b)

dominant

c)

homozygous dominant

d)

homozygous recessive

15.

Characteristic of an organism that makes it unique

a)

Genetics

b)

DNA

c)

Allele

d)

Heredity

16.

Instructions for an inherited trait

a)

Allele

b)

Genetics

c)

Gene

d)

Trait

17.

The passing of traits from parent to offspring

a)

Genetics

b)

Mendel

c)

Heredity

d)

Recessive

18.

Selective breeding is the process of breeding plants or animals so that they inherit particular traits from their parents. Which of these is not possible with selectively breeding a crop species?

a)

The crop becomes more tolerant to drought.

b)

The quality and yield of the crop improves.

c)

The crop becomes resistant to bacteria and fungi.

d)

The offspring will have all different traits from the parents.

19.

In rabbits, B represents the allele for black coat and b represents the allele for white coat. Black is dominant over white. If a rabbit has the genotype Bb, what is the rabbit's phenotype?

a)

gray

b)

black

c)

white

d)

BB x bb

20.

Gregor Mendel is best known for his work with pea plants and for helping uncover many of the mysteries of genetics. One of his major findings stated that there were specific, physical units of inheritance that are transmitted during reproduction. What is the the name given to these units of inheritance which can be found on chromosomes?

a)

centromeres

b)

cytoplasm

c)

genes

d)

nucleotides

21.

The nucleus contains the cells genetic material in the form of

a)

ADP

b)

ATP

c)

DNA

d)

RNA

22.

What technique enables scientists to determine match DNA to an unknown person.

a)

cloning

b)

transformation

c)

DNA fingerprinting

d)

reverse transcription

23.

What technique enables scientists to determine match DNA to an unknown person.

a)

cloning

b)

transformation

c)

DNA fingerprinting

d)

reverse transcription

24.

What is one distinct DISADVANTAGE of sexual reproduction?

a)

Organisms that sexually reproduce do not produce much genetic variety.

b)

Sexual reproduction, unlike asexual reproduction, can rapidly produce too many new offspring.

c)

Sexual reproduction requires two individuals, which may be difficult for endangered or uncommon species of organisms.

d)

Sexual reproduction produces offspring that are all equally vulnerable to the same diseases, predators, and other environmental pressures.

25.

A human skin cell contains 46 chromosomes. How many chromosomes are present in a human egg cell?

a)

23

b)

46

c)

92

d)

138

26.

Which describes a trait from a recessive gene?

a)

It causes a mutation.

b)

It masks a dominant gene trait.

c)

It can appear if it is heterozygous.

d)

It usually appears only if it is homozygous.

27.

Things like your eye color and height are not under your control. This is because they are determined by your genes.


So, eye color is a good example of an inherited __________.

a)

estate

b)

gene

c)

height

d)

trait

28.

Things like your eye color and height are not traits you can control. In fact, you inherit traits like these from your parents. These traits are passed on because they are controlled by ____________.

a)

LNA

b)

genes

c)

hormones

d)

tradition

29.

Which crisis can be improved by selective breeding?

a)

famine

b)

pollution

c)

global warming

d)

overpopulation

30.

Which is an ADVANTAGE of sexual reproduction?

a)

Two parents are required.

b)

Only one parent is required.

c)

It leads to genetically diverse offspring.

d)

It leads to genetically identical offspring.

31.

Cattle species A have good resistance to high temperature, but its meat is poor. Cattle species B has good meat, but poor resistance to high temperatures. Scientists formed the a new species of cattle by breeding A with B .This new type of cattle has good meat and resistance to high temperatures. This is an example of

a)

inbreeding

b)

natural selection

c)

selective breeding

d)

genetic engineering

32.

In some instances, humans breed animals that are close relatives to produce desired traits. This is called

a)

cloning

b)

random mating

c)

artificial selection

d)

inbreeding

33.

The process of ____________ increases genetic variability as it produces gametes for sexual reproduction.

a)

conjugation

b)

mitosis

c)

meiosis

d)

replication

34.

What situation is an example of artificial selection?

a)

Female bluegill fish prefer to lay their eggs in the nests of larger male fish.

b)

Albino deer or rabbits have a low survival rate in nature, because it is easy for predators to spot them.

c)

Penguins with higher body fat tend to survive nesting in the Antarctic winter, while leaner penguins often die.

d)

More African elephants today naturally lack tusks compared to the elephant populations 100 years ago, because big game hunters sought elephants for ivory.

35.

DNA fingerprinting would most likely be used to:

a)

identify human age and lifespan

b)

determine genetic relationships

c)

diagnose different types of cancer

d)

create genetically-identical species

36.

An organism with 32 chromosomes in each body cell will produce sex cells with __________ chromosomes.

a)

18

b)

32

c)

64

d)

12

37.

In rabbits, the allele for black fur, B, is dominant over the allele for brown fur, b.


Calculate the probability of a homozygous dominant (BB) offspring resulting from a cross between two parents with the genotype Bb

a)

1100\frac{1}{100}

b)

12\frac{1}{2}

c)

14\frac{1}{4}

d)

710\frac{7}{10}

38.

What is the purpose of DNA?

a)

manufactures proteins

b)

reduces activation energy

c)

stores hereditary information

d)

to aid in facilitated diffusion