# Chapter 3, Section 2: Question Preview (ID: 7345)

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Probability is the likelyhood that a particular event will occur. In genetics, probability can be used to-
a) determine the number of boys and girls in a family.
b) determine how many children a couple will have.
c) determine genetic possibilities.
d) none of these.

During a coin toss experiment, each toss is independent. This means that the probability of landing on heads is always-
a) 100%
b) 50%
c) 75%
d) 25%

A _______________ can be used to chart probabilities.
a) Probability Chart
b) Lattice Square
c) Rubik's Cube
d) Punnett Square

_______ is the physical appearance of an organism, while ______ is the gene combination.
a) Genotype; phenotype
b) Tall; short
c) Hybrid; purebred
d) Phenotype; genotype

_____________ is when you have two identical alleles. Examples are ______
a) Homozygous; TT or Tt
b) Homozygous; TT or tt
c) Heterozygous; TT or tt
d) Heterozygous; Tt or tt

______________ is when you have two different alleles. An example is ____
a) Homozygous; Tt
b) Heterozygous; TT
c) Homozygous; tt
d) Heterozygous; Tt

Choose the answer that best describes codominance -
a) When alleles are neither dominant nor recessive,but only the dominant allele shows.
b) When alleles are neither dominant nor recessive. Both alleles show themselves.
c) When alleles are only recessive but the dominant allele shows more.
d) When alleles are only dominant but have a little of the recessive allele.

An example of codominance is -
a) A chicken born with both black & white feathers from white parent & black parent.
b) A black cat crossed with a tan cat results in a tabby (black and tan striped) cat.
c) All of these.
d) None of these.

A cross between two heterozygous parents (Bb). The probability of a child having the bb genotype is-
a) 0 out of 4 or 0%
b) 1 out of 4 or 25%
c) 2 out of 4 or 50%
d) 3 out of 4 or 75%

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) 2 out of 4 or 50%
d) 3 out of 4 or 75%

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