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CHAPTER 4 TEST - GENETICS: THE SCIENCE OF HEREDITY - Form G

Total questions: 35

Worksheet time: 1hrs 10mins

Name
Class
Date
1.

What does the notation TT represent?

a)

two homozygous dominant alleles

b)

two homozygous recessive alleles

c)

a hybrid

d)

two heterozygous recessive alleles

2.

An organism's genotype is its

a)

genetic makeup

b)

physical appearance

c)

feather color

d)

eye color

3.

What does the chromosome theory of inheritance state?

a)

chromosomes are carried from parent to offspring on hybrids

b)

genes pass from parents to offspring on chromosomes

c)

hybrid pairs of chromosomes combine to form offspring

d)

codominant genes combine to form new allele based heterozygous offspring

4.

If a ______________________ allele is present , its trait will appear in the organism.

a)

dominant

b)

purebred

c)

probability

d)

recessive

5.

Tt would represent two heterozygous dominant alleles.

a)

true

b)

false

6.

Sex cells produced by meiosis have ____________ the number of chromosomes as the parent cells.

a)

twice

b)

half

c)

thrice

d)

100%

7.

An organisms phenotype is its allele combinations.

a)

true

b)

false

8.

If a cross between white flowers (W) and purple flowers (w), which color flower is dominant?

a)

dominant

b)

white

c)

recessive

d)

purple

9.

In a cross between flowers where white is dominant and purple is recessive, which allele combination represents a purple flower?

a)

WW

b)

Ww

c)

Pp

d)

ww

10.

75% is equal to _________.

a)

1/4

b)

2/4

c)

3/4

d)

4/4

11.

1/4 is equal to _________.

a)

0%

b)

25%

c)

50%

d)

75%

12.
A chart that shows all the possible combinations of alleles that can result from a genetic cross
a)
Gene
b)
Pedigree
c)
Punnett Square
d)
Dominant
13.
Heredity is the passing of traits from _____________________ to _____________________
a)
predators to prey
b)
water to rain
c)
parents to offspring
d)
fungi to protists
14.

The different form of a gene.

a)

Alleles

b)

Phenotype

c)

Hybrid

d)

Transfer RNA

15.

A number that describes how likely it is that an event will occur.

a)

Genotype

b)

Probability

c)

Prediction

d)

Mutation

16.

An organism's physical characteristics or visible traits.

a)

Hybrid

b)

Phenotype

c)

Genetics

d)

Mutation

17.

The scientific study of heredity.

a)

Punnett square

b)

Genetics

c)

Heredity

d)

Phenotype

18.

An organism's genetic makeup or allele combination.

a)

Phenotype

b)

Genetics

c)

Genotype

d)

Punnett Square

19.

If the body cells of an organism have 10 chromosomes, then the sex cells produced during meiosis would have

a)

5 chromosomes

b)

10 chromosomes

c)

15 chromosomes

d)

20 chromosomes

20.

How many pairs of chromosomes do human body cells contain?

a)

33

b)

42

c)

23

d)

16

21.

A couple has two children, both of whom are boys. What is the chance that the parents' next child will be a boy?

a)

0%

b)

50%

c)

25%

d)

75%

22.

Factors that control traits are called

a)

genes

b)

purebreds

c)

recessives

d)

parents

23.

If a homozygous black guinea pig (BB) is crossed with a homozygous white guinea pig (bb), what is the probability that an offspring will have black fur?

a)

25 percent

b)

50 percent

c)

75 percent

d)

100 percent

24.

What happens during meiosis?

a)

Two sex cells combine

b)

Chromosome pairs separate and are distributed into new sex cells

c)

Each sex cell copies itself to form four new chromosomes

d)

Chromosome pairs remain together when new sex cells are formed

25.

When sex cells combine to produce offspring, each sex cell will contribute

a)

one fourth the number of chromosomes in body cells

b)

half the number of chromosomes in body cells

c)

the normal number of chromosomes in body cells

d)

twice the number of chromosomes in body cells

26.

Three or more possible alleles of a gene that determines a trait

a)

incomplete dominance

b)

codominance

c)

multiple alleles

d)

polygenetic inheritance

27.

The inheritance of traits that are controlled by two or more genes, such as height in humans

a)

incomplete dominance

b)

codominance

c)

multiple alleles

d)

polygenic inheritance

28.

Occurs when both alleles for a trait are expressed equally

a)

incomplete dominance

b)

codominance

c)

multiple alleles

d)

polygenic inheritance

29.

Occurs when one allele is only partially dominant over another allele

a)

incomplete dominance

b)

codominance

c)

multiple alleles

d)

polygenic inheritance

30.

An allele that is hidden whenever the dominant allele is present

a)

bashful

b)

dominant

c)

strong

d)

recessive

31.

Chromosomes are made up of ________________ and ________________.

a)

amino acids and protiens

b)

sugars and protiens

c)

DNA and proteins

d)

RNA and protiens

32.

Female sex chromosomes

a)

XY

b)

XX

33.

Male sex chromosomes

a)

XX

b)

XY

34.

Traits that an organism is born with are called

a)

sex-linked traits

b)

acquired traits

c)

inherited traits

d)

Mendelian traits

35.

Skills you learn and physical changes that occur are called

a)

environmental traits

b)

inherited traits

c)

acquired traits

d)

Mendelian traits

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