Download Genetics Test Fall 2006

Biology 102
Genetics CFA
Name ______________________________
Date _______________ Period _____
_____ 1. A fertilized egg is called a(n):
a. gamete
b. chromosome
_____ 2. The passing of traits from parent to offspring: a. genetics
_____ 3. The different forms of a gene are called: a. gametes
c. allele
b. heredity
d. zygote
c. development
b. genotypes
c. alleles
d.maturation
d. zygotes
_____ 4. The Austrian monk who developed the basic rules of genetics while growing peas is:
a. Johnny Appleseed
b. Old McDonald
c. Mr. Greenjeans
d. Gregor Mendel
_____ 5. The tool used to predict the possible outcome of a genetic cross is called a:
a. a Mendelian box
b. a Punnett square
c. a genetic graph
d. a phenotypic box
_____ 6. A heterozygous organism would have the genotype: a. HH
_____ 7. The law of dominance states that
a. all alleles are dominant.
b. all alleles are recessive.
b. hh
c. Hh
d. HHHH
c. some alleles are dominant and others are recessive.
d. alleles are neither dominant nor recessive.
_____ 8. The phenotype of an organism:
a. represents its genetic composition
b. is the physical appearance
c. occurs only in homozygous organisms
d. cannot be observed
_____ 9. The laws of genetics apply to: a. plants only
b. animals only
c. pea plants only
d. all organisms
_____ 10. Organisms that have two identical alleles for a particular trait are said to be
a. hybrid.
b. homozygous.
c. heterozygous.
d. dominant.
_____ 11. Dihybrid crosses involve: a. 2 traits
b. dominant traits only
c. recessive traits only
T
_____.12. In figure A, which of the following is true about the offspring?
a. ½ are expected to be short
c. ½ are expected to be tall
b. all are expected to be short
d. all are expected to be tall
T
T
d. 1 trait only
t
TT
Tt
TT
Tt
T = Tall
t = short
Figure A
Complete a Punnett square and answer the questions for each of the following.
_____ 13. Free ear lobes are dominant to attached ear lobes. What will be the result in a cross
between 2 hybrids?
a. all free lobed
c. 75% free, 25% attached
b. 50% free, 50% attached
d. 25% free, 25% attached & 50% in between
_____ 14. If yellow is dominant to green, in a cross between a heterozygous plant and a green plant, the expected
phenotypic results would be
a. 25% green and 75% yellow
c. 25% green and 25% yellow
b. 50% green and 50 % yellow
d. 25% yellow and 75% green
_____ 15. In a cross between a homozygous tall plant and a homozygous short plant, the offspring would have:
a. the genotype of one of the parents.
b. a phenotype that was different from that of both parents.
c. a genotype that was different from that of both parents.
d. the genotype of both parents.
_____ 16. Use a Punnett square to predict the outcome of a cross between a homozygous
dominant brown-furred animal and a heterozygous brown-furred animal.
a. 50% white, 50% brown
c. 100% brown
b. 100%heterozygous
d. 50% heterozygous brown, 50% heterozygous white
_____ 17. A cross between a heterozygous brown-eyed person and a person recessive for
blue eyes will result in:
a. 1:1 phenotypic ratio
b. 3:1 phenotypic ratio
c. 1:2:1 phenotypic ratio
d. 1:3 phenotypic ratio
_____ 18. If a homozygous tall plant is crossed with a homozygous short plant, ____ of the
offspring will be tall.
a. 50%.
b. 75%.
c. 25%.
d. 100%.
_____ 19. A guinea pig homozygous dominant for black fur is mated with one that is
homozygous for white fur. In a litter of eight offspring, there would probably be:
a) 4 black and 4 white
b) 2 black, 4 gray and 2 white
c) 8 white
d) 8 black
Complete the following Punnett Squares and answer the questions.
T
T
T
T
T
T = tall pea plant
t = short pea plant
t
T
T
t
T
t
t
t
t
t
A.
B.
t
D.
C.
_____ 20. Which cross is between a homozygous dominant parent and a homozygous recessive parent?
_____ 21. Which cross is between two heterozygous parents?
_____ 22. Which cross will produce all tall pea plants with some being homozygous dominant?
_____ 23. Which cross will produce 50% short pea plants?
_____ 24. Which cross is between a homozygous dominant parent and a heterozygous parent?
_____ 25. Which cross is between a homozygous recessive parent and a heterozygous parent?
_____ 26. The phenotypic ratio for A is: a) 2:2
b) 1:2:1
c) 4:0
d) 3:1
_____ 27. The phenotypic ratio for B is: a) 2:2
b) 1:2:1
c) 4:0
d) 3:1
_____ 28. The genotypic ratio for B is:
a) 2:2
b) 1:2:1
c) 4:0
d) 3:1
_____ 29. The genotypic ratio for C is:
a) 2:2
b) 1:2:1
c) 4:0
d) 3:1
_____ 30. A white mouse whose parents are both white produces only brown offspring when mated with a brown
mouse. The white mouse is most probably ____.
a. homozygous recessive
b. heterozygous
c. homozygous dominant
d. haploid
_____ 31. In mice, black fur is dominant to white fur. Two black mice are crossed. They produce 2 black offspring
and one white offspring. If the white offspring is crossed with one of its parents, what % of the offspring
are expected to be white?
a. 0
b. 25
c. 50
d. 75
_____ 32. In chickens, a double comb is dominant to single comb. A homozygous double-combed rooster is mated
with a single-combed hen. All of the F1 generation were kept together as a group for several years. They
were allowed to mate only within their own group. What is the expected phenotype of the F2 chicks?
a. 100% double comb
c. 100% single comb
b. 75% double comb and 25% single comb
d. 50% duble comb and 50% single comb
_____ 33. In mink, brown fur is dominant to silver-blue fur. If a homozygous brown mink is mated with a silver-blue
mink and 8 offspring are produced, how many would be expected to be silver-blue?
a. 0
b. 3
c. 6
d. 8
_____ 34. A true-breeding tall pea plant is crossed with a true-breeding short pea plant, and all the offspring
are tall. What is the most likely genotype of the offspring assuming a single-gene trait?
a. tt
b. Tt
c. TT
d. TT or tt
_____ 35. A heterozygous organism is best described as which of these?
a. dominant
b. genotype
c. hybrid
36. Label ALL the individuals in the pedigree on the lines provided.
A
B
C
D
E
F
d. true-breeding