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Genetics Review 02 - Bio 9th

Total questions: 20

Worksheet time: 18mins

Name
Class
Date
1.
In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?
a)
Tall = T
Short = S
b)
Tall = T
Short = t
c)
Tall = t
Short = T
d)
Tall = TT
Short = tt
2.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
25%
c)
50%
d)
75%
3.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
25%
c)
50%
d)
75%
4.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
5.

In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any white-flowering plant resulting from this species?

a)

rr

b)

rR

c)

RR

d)

Rr

6.

Different versions of a trait (tall or short, white or purple) are called

a)

alleles

b)

traits

c)

versions

d)

genes

7.

Which of the following is considered to be Homozygous Dominant?

a)

AA

b)

Aa

c)

aa

8.

In pea plants, purple is dominant to white. If a plant has a genotype of Pp, what is its phenotype?

a)

purple

b)

white

c)

purple and white

9.

In cows, red and white hair is codominant. If you cross a red cow and a white cow, the offspring would be...

a)

red

b)

white

c)

red and white

d)

pink

10.

In a dihybrid cross, what is the genotype for a plant that is heterozygous for height (T) and homozygous recessive for color (P)

a)

Ttpp

b)

TTPP

c)

TtPp

d)

TtPP

11.

Based on this Punnett Square, what is the chance of getting a female with white eyes?

a)

0%

b)

25%

c)

50%

d)

100%

12.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
13.
What is the phenotype of the offspring? (A-Brown hair; a-blond hair) 
a)
50 % Brown Hair and 50% Blond Hair 
b)
25 % Brown Hair and 75% Blond Hair 
c)
75 % Brown Hair and 25% Blond Hair 
d)
0% Brown Hair and 100% Blond Hair 
14.
In the punnett square shown, what is the genotypes of the two parents?
a)
RW and RR
b)
RW and WW
c)
RR and WW
d)
RW and RR
15.

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

a)

1

b)

2

c)

3

d)

4

16.
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 pink (RW) flowers?
a)
0%
b)
25%
c)
50%
d)
100%
17.
In some carnations, flower color exhibits codominance. When crosses, Red (R) and white (W) flowers make speckled flowers (RW) that show both colors.
Complete a cross between 2 speckled flowers and find the genotype ratio.
a)
0 RR: 4 RW: 0 WW
b)
2 RR: 2 RW: 0 WW
c)
1 RR: 2 RW: 1 WW
d)
0 RR: 2 RW: 2 WW
18.

The following punnett square depicts the x-linked cross of a female who carries hemophilia with a man showing no symptoms. Fill in the genootype represented by the blank box in the punnett square.

a)

XH XH

b)

Xh XH

c)

XH Y

d)

Xh Y

19.

If purple (P) flowers are dominant to white (p) flowers, then what percentage of the offspring heterozygous purple?

a)

0%

b)

25%

c)

50%

d)

100%

20.

What type of inheritance is determined by multiple genes and there can be a range of traits?

a)

Codominance

b)

Incomplete dominance

c)

Polygenic traits