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WorksheetsRETEST ELM 4.3
Total questions: 15
Worksheet time: 55mins
Name
Class
Date
1.
Which of these represents the number of chromosomes in cells before and after the process of meiosis?
a)
n --> n
b)
n --> 2n
c)
2n --> n
d)
2n --> 2n
2.
What does heterozygous mean?
a)
An organism that has the same genes for a trait (TT or tt)
b)
An organism that has different genes for a trait (Tt)
c)
When neither gene is fully dominant; offspring is a mixture of both
d)
the different forms of a trait (hair color--> brown, blonde, red
3.
W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
a)
none
b)
3/4
c)
1/2
d)
all
4.
Two heterozygous (Tt)tall pea plants are crossed. Which describes their offspring?
a)
50% tall and 50% short
b)
75%tall and 25% short
c)
100%short
5.
Which event during meiosis causes GENETIC VARIATION?
a)
crossing over
b)
protein synthesis
c)
cytokinesis
6.
What is a phenotype?
a)
The expression of a trait; what you see.
b)
refers to the genetic makeup of an individual
c)
An organism that has the same genes for a trait (ex. TT or tt)
d)
the passing of traits from parent to offspring
7.
B=brown eyes
b= blue eyes
What is true about two brothers that have brown eyes?
One has genotype BB the other Bb.
b= blue eyes
What is true about two brothers that have brown eyes?
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
8.
B = brown fur b = white fur
In the punnett square, what is the probability for white fur?
In the punnett square, what is the probability for white fur?
a)
0%
b)
25%
c)
50%
d)
75%
9.
In mussels, the allele for brown coloring (B) is dominant, and the allele for blue coloring(b) is recessive. For which parental genotypes are 100% of the offspring expected to be blue?
a)
BbxBb
b)
bbxbb
c)
BBxbb
d)
BBxBB
10.
A change in gene linkage during meiosis would most likely result from...
a)
DNA replication
b)
ATP synthesis
c)
crossing over
d)
independent assortment
11.
In a fruit fly in which the diploid number of chromosomes is 8, the chromosome number in each gamete is normally
a)
16
b)
2
c)
8
d)
4
12.
In pea plants, the allele for tallness is dominant over the allele for shortness. Tall pea plants are crossed with short pea plants, and the cross results in 271 tall plants and 268 short plants. Based on this cross the genotype of the parental tall pea plants can be correctly described as...
a)
homozygous
b)
heterozygous
c)
pure recessive
d)
pure dominant
13.
Meiosis in animals is directly responsible for the...
a)
formation of gametes
b)
fertilization of an egg
c)
growth of a cell
d)
production of muscle cells
14.
In pea plants, the gene for tallness (T) is dominant over the gene for shortness (t). If 100% of the F1 generation offspring are heterozygous tall, what were the most probable genotypes of the parent plants?
a)
Tt x Tt
b)
Tt x tt
c)
TT x Tt
d)
TT x tt
15.
In a garden pea plants, the tall allele (T) is dominant to the short allele (t), and the round seed allele (R) is dominant to the wrinkled seed allele (r). Which of the following crosses could produce short pea plants with wrinkled seeds?
a)
TtRr x TTRR
b)
TTRr x TTRr
c)
TtRr x Ttrr
d)
TtRR x ttRR
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