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Pedigrees

Total questions: 20

Worksheet time: 20mins

Name
Class
Date
1.

The following pedigree chart shows _______ females and ______ males that DO NOT have the trait.

a)

7, 3

b)

4, 4

c)

3, 2

d)

3, 3

e)

57, 93.5

2.
How many generations are shown in this pedigree?
a)
1
b)
2
c)
3
d)
4
3.

How many daughters did the mother and father from the first generation have?

a)

2

b)

4

c)

5

d)

6

4.

How many males are carriers?

a)

2

b)

3

c)

4

d)

5

5.

Is this pedigree dominant, recessive, or sex-linked recessive?

a)

Dominant

b)

Recessive

c)

Sex-Linked Recessive

6.

Is this pedigree dominant, recessive, or sex-linked recessive?

a)

Dominant

b)

Recessive

c)

Sex-Linked Recessive

7.

If a child shows a recessive disorder, and his brother does not, his healthy parents' genotypes are;

a)

Hh and Hh

b)

HH and HH

c)

Hh and HH

d)

hh and hh

8.
Examine the pedigree. The allele for the presence of a widow’s peak is dominant. Therefore, we can tell from the chart that in the couple labeled 2:
a)
the male is heterozygous and the female is homozygous.
b)
the male is homozygous and the female is heterozygous.
c)
the male is homozygous and the female is homozygous.
d)
the male is heterozygous and the female is heterozygous.
9.
If hemophilia is a sex-linked recessive trait, what genotype would individual III-3 have?
a)
XbX
b)
XbXb
c)
XbYb
d)
XbY
10.
Why do all the daughters in Generation II carry the colorblind gene?
a)
Because mom passed on the gene.
b)
Because dad passed on the X chromosome.
c)
Because their brother has it.
d)
Because their brother gave it to them.
11.

Cystic fibrosis is an autosomal recessive disease .


Study the pedigree what are the possible genotypes of #10? (more than one answer)

a)

AA

b)

Aa

c)

aa

d)

XAXa

12.

What is the genotype of the mother? Hint Draw a punnett square

a)

BB

b)

bb

c)

Bb

d)

BB or Bb

13.

Generation 2 individuals 5 and 6 are

a)

brother and sister.

b)

cousins.

c)

married.

d)

not related.

14.
 Look at the Punnett square. If the two parents represented in the Punnett square have four offspring, what does the Punnett square tells you?
a)
two of the offspring will definitely be heterozygous.  
b)
one of the offspring will definitely show the recessive trait.
c)
there is a 50% chance for each of the 4 offspring to have the genotype Rr.
d)
there is a greater chance for the offspring to be RR than rr.
15.

How many alleles does a child get from each parent for a trait?

a)

1

b)

2

c)

3

d)

4

16.

How many alleles does a person carry for a trait?

a)

1

b)

2

c)

3

d)

4

17.
What do we use pedigrees for?
a)
To look at families
b)
To make determinations about the offspring
c)
To track traits in families
d)
Nothing
18.

On a pedigree, this symbol represents a ---

a)

not affected female.

b)

not affected male.

c)

affected male.

d)

affected female.

19.

On a pedigree, this symbol represents a ----

a)

not affected male.

b)

not affected female.

c)

affected male.

d)

affected female.

20.

How are individuals III-2 and II-4 related?

a)

Brother and sister

b)

Dad and daughter

c)

Uncle and niece

d)

Grandfather and granddaughter

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