Some dogs have erect ears

							 1. A pedigree can be used to
    A) determine whether a trait is inherited. B) show how a trait is passed from one generation to the next.
    C) determine whether an allele is dominant or recessive. D) all of the above
 2. Which of the following designates a normal human male?
    A) YY B) XX C) XY D) XO E) XYY
 3. If a daughter expresses an X-linked recessive gene, she inherited the trait from
    A) her mother. B) her father. C) both parents. D) neither parent. E) her grandmother.
 4. In a pedigree chart a male showing the specific trait being studied is indicated by a
    A) darkened square. B) clear square. C) darkened diamond. D) clear triangle. E) darkened circle.
 5. If a child belonged to blood type O, he or she could not have been produced by which set of parents?
    A) Type A mother and type B father B) Type A mother and type O father C) Type AB mother and type O father
    D) Type O mother and type O father
 6. A dihybrid cross of two contrasting pure-breeding organisms
    A) produces homozygous offspring. B) must produce a phenotype different from either pure-breeding parent.
    C) results in the disappearance of the recessive traits for the first generation. D) takes place only in the laboratory
    under precisely controlled conditions. E) will result in the immediate formation of another pure-breeding variety.
 7. Chromosomes other than those involved in sex determination are known as
    A) nucleosomes. B) heterosomes. C) alleles. D) autosomes. E) liposomes.
 8. A cross of a black chicken (CBCB) with a white chicken (CWCW) produces all “blue” offspring (CBCW). This type of
    inheritance is known as
    A) intermediate inheritance. B) polygenic inheritance. C) codominance. D) multiple alleles.
 9. Which of the following designates a normal human female?
    A) XXY B) XY C) XX D) XYY E) XO
10. If a woman who is a carrier of a sex-linked trait married a man with the trait, the chance that a child would have the
    trait would be
    A) 25 percent. B) 50 percent. C) 75 percent. D) 100 percent.
11. A colorblind man and a woman with normal vision whose father was colorblind have a son. Colorblindness, in this
    case, is caused by an X-linked recessive gene. If only the male offspring are considered, the probability that their son
    is colorblind is
    A) .25 (or 25 percent). B) .50 (or 50 percent). C) .75 (or 75 percent). D) 1.00 (or 100 percent).
12. Some dogs have erect ears; others have drooping ears. Some dogs bark when following a scent; others are silent.
    Erect ears and barking are due to dominant alleles located on different chromosomes. A dog homozygous for both
    dominant traits is mated to a droopy-eared, silent follower. The phenotypic ratio expected in the F1 generation is
    A) 9:3:3:1. B) 100 percent of one phenotype. C) 1:1. D) 1:2:1. E) none of these
13. Coat color in one breed of mice is controlled by incompletely dominant alleles so that yellow and white are
    homozygous, while cream is heterozygous. The cross of two cream individuals will produce
    A) all cream offspring. B) equal numbers of white and yellow mice, but no cream. C) equal numbers of white and
    cream mice. D) equal numbers of yellow and cream mice. E) equal numbers of white and yellow mice, with twice
    as many creams as the other two colors.
14. If red (RR) is crossed with white (rr) and produces a pink flower (Rr), and tall (D) is dominant to dwarf (d), the F2
    phenotypic ratio from a cross of RR dd with rr DD would be
    A) 9:3:3:1. B) 1:1:1:1. C) 1:2:2:4:1:2:1:2:1. D) 3:6:3:1:2:1. E) none of these
15. Colorblindness is more common in males than in females because
    A) fathers pass the allele for colorblindness to their sons only. B) the allele for colorblindness is located on the Y
    chromosome. C) the allele for colorblindness is recessive and located on the X chromosome. D) males who are
    colorblind have two copies of the allele for colorblindness.
16. How many chromosomes are shown in a normal human karyotype?
    A) 2 B) 23 C) 44 D) 46
17. The F2 phenotypic ratio of a monohybrid cross involving a gene with incompletely dominant alleles is
    A) 1:1. B) 2:1. C) 9:3:3:1. D) 1:2:1. E) 3:1.
18. In incomplete dominance
    A) one allele is not dominant to another allele. B) the genotype can be determined by the phenotype. C) the
    heterozygote is somewhat intermediate to the two homozygotes. D) the intermediate phenotype may be the result of
    enzyme insufficiency. E) all of these
19. A woman heterozygous for colorblindness (an X-linked recessive allele) marries a man with normal color vision.
    What is the probability that their first child will be colorblind?
    A) 25 percent B) 50 percent C) 75 percent D) 100 percent E) none of these
20. A karyotype
    A) compares one set of chromosomes to another. B) is a visual display of chromosomes arranged according to size.
    C) is a photograph of cells undergoing mitosis during anaphase. D) of a normal human cell shows 48 chromosomes.
    E) cannot be used to identify individual chromosomes beyond the fact that two chromosomes are homologues.
21. In karyotyping, individual chromosomes may be distinguished from others by
    A) a comparison of chromosome lengths. B) bands produced on chromosomes by differential staining. C) the
    position of centromeres. D) all of these E) none of these
22. In a pedigree chart a female who does not demonstrate the trait being studied is represented by a
    A) darkened square. B) clear diamond. C) clear circle. D) darkened triangle. E) darkened oval.
23. In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If
    two dihybrids (Bb Ss) were crossed, the most common phenotype would be
    A) black and solid. B) black and spotted. C) red and solid. D) red and spotted. E) none of these

24. An individual with a genotype of Aa Bb CC is able to produce how many different kinds of gametes?
    A) 2 B) 3 C) 4 D) 7 E) 8

25. If a cross between a pure blue eyed frog and a pure green eyes from produces all light-blue eyed offspring, which of
     Mendel’s laws applies?
     A) the law of dominance B) the law of incomplete dominance C) the law of Co-dominance
     D) the law of independent assortment

26. In guinea pigs, brown coat color is dominant over white coat color. If two heterozygous brown guinea pigs are mated,
     the phenotype ratio of brown to white color in the offspring would be
     A) 1:3 B) 3:1 C) 1:2:1 D) 9:3:3:1

27. When a pure brown eyed sheep is crossed with a pure green eyed sheep, spotted green and brown eyed offspring are
     produced. Which of Mendel’s laws applies?
     A) the law of dominance B) the law of incomplete dominance C) the law of Co-dominance
     D) the law of independent assortment

     Short Answer:
     Organism: Montgomery Flying Deer
                    Gene                                      Alleles                                  Alleles
                  Wing size                                  Large (L)                                Small (l)
                Flying speed                                  Fast (F)                                Slow (f)
                 Coat color                                 Brown (CB)                               White (CW)
                 Nose color                                   Red (R)                                Black (R´)
1.      a)Show the cross of a pure brown coat with a pure white coat
        b) What are the phenotypes for the offspring?

2.      a) Cross two hybrid light-red noses
        b) What are the phenotypes for the offspring?

3.      a) Cross a black nose with a light-red nose
        b) What are the phenotypes for the offspring?

4.      a) Draw the punnett square to show the cross between two deer that are both hybrid for wing size and
hybrid for flying speed.
        b) What are the phenotypes of the offspring?


5. Hemophilia is a sex-linked recessive trait.

        a) What symbols would be appropriate to represent:

        A pure normal female:__________                                A male with hemophilia: ____________
        A normal male: ____________                                    A female with hemophilia: ____________
        A carrier female: ___________

        b) A normal female has an affected grandfather (on her fathers side). She is concerned that she may on the
disease to her children. Should she be concerned? Explain?

6. Pedigree.                                                 ANN




Andy and Troy met at a color-blind support group and soon discover they are related. They share a Great, Great
Grandmother (Ann). Is Ann the origin of their condition? Explain.