Download IB BIO I Monohybrid and Dihybrid Cross Quiz Van Roekel Name

IB BIO I
Monohybrid and Dihybrid Cross Quiz
Name
1.
Date
Van Roekel
Period
If a purple flowered (Pp) and a white flowered pea plant (pp) are crossed, what will the
offspring be?
A.
1 : 1 ratio of purple and white flowers
B.
3 : 1 ratio of purple to white flowers
C.
1 : 3 ratio of purple to white flowers
D.
All purple flowers
(Total 1 mark)
2.
Mendel crossed pure breeding (homozygous) tall pea plants with pure breeding dwarf pea
plants. All of the resulting F1 plants were tall.
If Mendel had crossed two of these F1 plants together, what proportion of tall plants would be
expected in the offspring?
A.
25%
C.
75%
B.
50%
D.
100%
(Total 1 mark)
3.
A gene in cattle controls whether horns develop or not. When cattle without horns are mated
together, none of the offspring ever has horns. A male with horns is mated with females without
horns. If half of the offspring have horns and half do not, what is the conclusion?
A.
The male is homozygous dominant.
B.
The male is homozygous recessive.
C.
The male is heterozygous.
D.
Only males have horns.
(Total 1 mark)
4.
An individual that has a genotype with two of the same alleles would be considered what?
A.
Homozygous.
C.
Heterozygous.
B.
Dominant.
D.
Hybrid.
(Total 1 mark)
5.
What is a genome?
A.
A heritable factor that controls a specific characteristic such as hair or eye color.
B.
The complete set of an organism’s base sequences, or all of its genes.
C.
The different forms of a gene, which could be considered dominant or recessive.
D.
The specific location of a sequence on DNA on a particular chromosome.
(Total 1 mark)
1
IB BIO I
6.
Monohybrid and Dihybrid Cross Quiz
Van Roekel
What is the genetic cross called between an individual of unknown genotype and an individual
who is homozygous recessive for a particular trait?
A.
Test-cross
C.
Dihybrid cross
B.
Hybrid cross
D.
F1 cross
(Total 1 mark)
7.
If red (RR) is crossed with white (rr) and produces a red flower (Rr), and tall (D) is dominant to
dwarf (d), what is the phenotypic ratio from a cross of Rrdd and rrDd?
A.
9 tall red flowers : 3 tall pink flowers : 3 short pink flowers : 1 short white flower
B.
50% tall red flower , 50% tall white flowers
C.
3 short white flowers : 1 tall red flower
D.
1 tall red flower : 1 tall white flower : 1 short red flower : 1 short white flower
(1)
8.
A pure breeding tall plant with smooth seeds was crossed with a pure breeding short plant with
wrinkled seeds. All the F1 plants were tall with smooth seeds. Two of these F1 plants were
crossed and four different phenotypes were obtained in the 400 plants produced. How many
short plants with wrinkled seeds would you expect to find?
A.
225
C.
25
B.
75
D.
150
(Total 1 mark)
9.
A genetic cross was made between pure-breeding snapdragon plants with red flowers and purebreeding snapdragon plants with white flowers. The cross produced F 1 offspring that had only
red flowers. When the F1 plants were self-pollinated, the resulting F2 generation had some red
and some white flowers.
(a)
State which allele is dominant and which allele is recessive.
..........................................................................................................................
(1)
(b)
Deduce the genotype of the F1 plants.
..........................................................................................................................
(1)
(c)
Construct a Punnett grid to show the cross between two F1 plants.
(1)
(d)
Deduce the proportion of the different genotypes and phenotypes of the F2
offspring.
..........................................................................................................................
..........................................................................................................................
(2) Total 5 Marks
2
IB BIO I
10.
Dihybrid Check-up
Van Roekel
A farmer has rabbits with two particular traits, each controlled by a separate gene. Coat color
brown is completely dominant to white. Tailed is completely dominant to tail-less. A
homozygous brown, tailed male rabbit is crossed with a white, tail-less female rabbit. A large
number of offspring are produced with only one phenotype.
(a)
State both parents’ genotypes and the gametes that are produced by each during the
process of meiosis.
Male genotype:
........................................................................................
Female genotype:
........................................................................................
Male gametes:
........................................................................................
Female gametes:
........................................................................................
(2)
(b)
Suppose two rabbits from the F1 generation are bred together. Predict the
phenotypic ratio of the F2 generation. Show your work.
..........................................................................................................................
..........................................................................................................................
(2)
(Total 4 Marks)
7.
Define the terms gene and allele, as well as dominant and recessive.
(Total 4 marks)
8.
Describe Mendel’s three laws of genetics.
(Total 6 marks)
3