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Chapter 3, Section 2
Test Description: Probability and Genetics
Instructions: Answer all questions to get your test result.
1) Probability is the likelyhood that a particular event will occur. In genetics, probability can be used to-
A
none of these.
B
determine genetic possibilities.
C
determine how many children a couple will have.
D
determine the number of boys and girls in a family.
2) During a coin toss experiment, each toss is independent. This means that the probability of landing on heads is always-
A
75%
B
100%
C
25%
D
50%
3) A _______________ can be used to chart probabilities.
A
Punnett Square
B
Rubik's Cube
C
Lattice Square
D
Probability Chart
4) _______ is the physical appearance of an organism, while ______ is the gene combination.
A
Hybrid; purebred
B
Phenotype; genotype
C
Tall; short
D
Genotype; phenotype
5) _____________ is when you have two identical alleles. Examples are ______
A
Heterozygous; Tt or tt
B
Heterozygous; TT or tt
C
Homozygous; TT or tt
D
Homozygous; TT or Tt
6) ______________ is when you have two different alleles. An example is ____
A
Heterozygous; TT
B
Heterozygous; Tt
C
Homozygous; tt
D
Homozygous; Tt
7) Choose the answer that best describes codominance -
A
When alleles are only dominant but have a little of the recessive allele.
B
When alleles are neither dominant nor recessive. Both alleles show themselves.
C
When alleles are neither dominant nor recessive,but only the dominant allele shows.
D
When alleles are only recessive but the dominant allele shows more.
8) An example of codominance is -
A
None of these.
B
All of these.
C
A chicken born with both black & white feathers from white parent & black parent.
D
A black cat crossed with a tan cat results in a tabby (black and tan striped) cat.
9) A cross between two heterozygous parents (Bb). The probability of a child having the bb genotype is-
A
2 out of 4 or 50%
B
3 out of 4 or 75%
C
0 out of 4 or 0%
D
1 out of 4 or 25%
10) A cross between two heterozygous parents (Ss). The probability of a child having the same PHENOTYPE as the parents-
A
0 out of 4 or 0%
B
1 out of 4 or 25%
C
3 out of 4 or 75%
D
2 out of 4 or 50%
*select an answer for all questions
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