Biology 1406
Final Exam
Spring 2016
Please choice the correct answer then mark the correct answer on your scantron.
1) A heterozygous tall (Tt) plant is crossed at with a short plant (tt). The probability that
offspring plants will be tall is...
A) 25%
B) 50%
C) 75%
D) 100%
2) A heterozygous tall (Tt) plant is crossed at with a short plant (Tt). The probability that
offspring plants will have a heterozygous genotype is...
A) 25%
B) 50%
C) 75%
D) 100%
3) A _____ allele is one whose trait always shows up in the organism.
A) recessive
B) dominant
C) heterozygous
D) homozygous
4) A _____ allele is one whose trait always absent or not seen in the organism.
A) recessive
B) dominant
C) heterozygous
D) homozygous
5) An organism's ___ is its physical appearance, or its visible traits.
A) phenotype
B) genotype
C) recessive
D) dominant
6) A heterozygous tall (Tt) plant is crossed at with a short plant (Tt). The probability that
offspring plants will have a heterozygous genotype is...
A) 25%
B) 50%
C) 75%
D) 100%
7) A heterozygous tall (Tt) plant is crossed at with a short plant (tt). What percentage of
the plants will be short?
A) 25%
B) 50%
C) 75%
D) 100%
8) A heterozygous tall (Tt) plant is crossed at with a short plant (Tt). What percentage of
the plants offspring will be homozygous dominant?
A) 25%
B) 50%
C) 75%
D) 100%
The following questions refer to the pedigree chart in Figure 14.2 for a family, some of
whose members exhibit the dominant trait, W. Affected individuals are indicated by a
dark square or circle.
Figure 14.2
9) What is the genotype of individual II-5?
A) WW
B) Ww
C) ww
D) WW or ww
E) ww or Ww
9) What is the likelihood that the progeny of IV-3 and IV-4 will have the trait?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%
11) What is the probability that individual III-1 is Ww?
A) 3/4
B) 1/4
C) 2/4
D) 2/3
E) 1
12) A female whose father was colorblind marries and normal male whose father was
also colorblind. What is the probability that their son will be colorblind?
A) 0 %
B) 25 %
C) 50%
D) 75%
13) A female whose father was colorblind marries and normal male whose father was
also colorblind. What is the probability that their daughter will be colorblind?
A) 0 %
B) 25 %
C) 50%
D) 75%
14) Sex-linked disorders such as color blindness and hemophilia
A) are on the X chromosome
B) on the autosome
C) on the Y chromosome the same as sex-influenced traits such as baldness; they
are simply more likely to be expressed in men
D) expressed only when two chromosomes are homozygous recessive