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Chromosomal Basis of Inheritance

Total questions: 26

Worksheet time: 27mins

Name
Class
Date
1.

Which of the following would NOT be a piece of information that led to the discovery of Chromosome Theory of Inheritance?

a)

chromosomes are present in pairs

b)

homologous chromosomes separate during meiosis

c)

fertilization restores the diploid count

d)

none of the choices

2.

Why did Morgan choose fruit flies as a model organism?

a)

short life cycle

b)

few offspring

c)

little genetic variation

d)

large chromosome count

3.

What was the first "mutant" discovered by Morgan?

a)

male with red eyes

b)

male with white eyes

c)

female with red eyes

d)

female with white eyes

4.

True/False: Genes that are found on the same chromosome are less likely to segregate/independently assort from one another.

a)

True

b)

False

5.

When does recombination first occur in meiosis?

a)

prophase I

b)

prophase II

c)

metaphase I

d)

metaphase II

6.

Which of the following chromosome combinations will result in a female in humans?

a)

XY

b)

X

c)

XX

d)

YY

7.

How many X chromosomes are typically expressed in humans and cats?

a)

1

b)

2

c)

3

d)

4

8.

Which of the following best describes having either one extra or one less chromosome?

a)

hapaploidy

b)

polyploidy

c)

diploidy

d)

aneuploidy

9.

Which of the following best describes having more than two sets of chromosomes?

a)

hapaploidy

b)

diploidy

c)

polyploidy

d)

aneuploidy

10.

Which of the following genetic alterations would result in reversal of a chromosome segment?

a)

inversion

b)

deletion

c)

duplication

d)

translocation

11.
Baldness is a recessive sex-linked trait. If a normal headed woman, whose father is bald, has children with a normal headed man, then which of the following would be true regarding their offspring?
a)
50% chance of a female with baldness
b)
100% chance of a male with baldness
c)
50% chance of offspring with baldness
d)
50% chance male offspring will be bald
12.
In humans, hemophilia is a sex linked recessive trait. Females can be normal, carriers, or have the disease. Males will either have the disease or not (but they won’t ever be carriers). A woman who is a carrier marries a normal man. What is the probability that their children will have hemophilia?
a)
0%
b)
25%
c)
50%
d)
100%
13.
What would we expect to happen in a test cross which involved genes that were closely linked?
a)
There would be a higher frequency of recombination.
b)
The offspring would show more individuals that represented the parents.
c)
The offspring would less individuals that represented the parents.
d)
The genes would assort themselves as if they were on separate chromosomes.
14.
A man who is an achondroplastic dwarf decides to have a child with a woman who does not share the condition.  They end up having 3 sons who are all normal and 3 daughters who are all achondroplastic dwarfs.  Which of the following is most likely true regarding achondroplastic dwarfism in order for this to occur.
a)
Achondroplastic dwarfism is a Y-linked dominant trait.
b)
Achondroplastic dwarfism is an X-linked dominant trait
c)
Achondroplastic dwarfism is an X-linked recessive trait
d)
Achondroplastic dwarfism results from a chromosomal translocation.
15.
Red-green colorblindness is a sex-linked recessive condition in humans.  If a woman with colorblindness marries a man who is normal, then what are the chances their daughter will have colorblindness?  What about their sons?
a)
daughters - 50%
sons - 50%
b)
daughters - 100%
sons - 100%
c)
daughters - 0%
sons - 100%
d)
daughters - 50%
sons - 0%
16.

What are the four bases of DNA?

a)

ATGC

b)

ATDC

c)

GCAS

d)

DNAB

17.
Who was the father of genetics 
a)
Sagan 
b)
Issac Newton 
c)
Gregor Mendel 
d)
C.jenkins 
18.

What is the function of the X and Y chromosomes?

a)

Eye colour

b)

Hair colour

c)

Height

d)

Sex

19.

IN Mirabilis jalapa WHEN THE PLANT WITH RED FLOWER CROSSED WITH THAT OF WHITE FLOWER F1 HYBRIDS SHOW FLOWERS WITH PINK COLOUR ,THIS IS DUE TO

a)

MENDELIAN DOMINANCE

b)

CODOMINANCE

c)

INCOMPLETE DOMINANCE

d)

ALL OF THE ABOVE

20.

THERE ARE 6 GENOTYPES TO REPRESENT 4 BLOOD GROUPS IN HUMAN BEINGS.WHICH ONE OF THE FOLLOWING GENOTYPES SHOWS CODOMINANCE

a)

IAIA

b)

IBIB

c)

IAI

d)

IAIB

21.

WHEN A MAN WITH BLOOD A GETS MARRIED TO A WOMAN WITH BLOOD GROUP B ,THEN THEIR FIRST CHILD HAS BLOOD GROUP O.FIND OUT PROBABILITY OF OTHER BLOOD GROUPS THEIR CHILDREN.

a)

A,B,AB

b)

B,O

c)

A,O

d)

A,AB

22.

In a heterozygous offspring, there is a blending of the traits.

a)

codominance

b)

incomplete dominance

c)

polygenetics

d)

multiple alleles

e)

sex linked

23.

This picture is example of what type of trait? (no this is not how pandas are made)

a)

codominance

b)

incomplete dominance

c)

polygenetics

d)

multiple alleles

e)

sex linked

24.

A woman develops skin cancer after prolonged exposure to ultraviolet radiation from sun tanning. Would her future children be at risk of inheriting this skin cancer?

a)

A. Yes, if she had a baby after developing skin cancer.

b)

B. Yes, this is a mutation in the DNA of her somatic cells.

c)

C. No, this condition does not affect the woman's egg cells.

d)

D. No, babies cannot get skin cancer because they are immune.

25.
circumstance where the expression of one gene is affected by the expression of one or more independently inherited genes
a)
epigenetics
b)
epistasis
c)
epigenome
d)
enzyme
26.

Which of the following means many traits?

a)

Codominance

b)

Multi-Genetics

c)

Polygenic

d)

Incomplete Dominance

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