Download Genetics Test ____ 1. Two similar chromosomes that you inherit

Genetics Test
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1. Two similar chromosomes that you inherit from your parents (one from your mother, one from your father)
are called __________ ________________.
2. Meiosis produces cells with how many chromosomes?
3. Which of the following cell types is diploid?
a. ovum
b. sex cell
c. body cell
d. gamete
4. A distinguishing characteristic that can be inherited is a(n)
5. Punnett Squares question
6. Which of the following statements is true of homozygous alleles?
a. They are always inherited together.
b. They are different forms of the same trait.
c. They are identical forms of the same gene.
d. They are identical forms of two different genes.
7. Which law states that organisms inherit two copies of each gene and donate one copy to each of their
offspring?
8. Mendel knew that the variations in the offspring generations resulted from his experiments because he
a. allowed plants to cross-pollinate randomly.
b. ensured that plants reproduced.
c. controlled the fertilization process.
d. changed the growing conditions.
9. Which pair of genes in Figure 6.2 would be most likely to be inherited together? A and ___
____ 10. Recessive alleles may not be expressed because they are
a. masked by a dominant allele.
b. the least common allele in a population.
c. the most common allele in a population.
d. less likely to have crossing over.
____ 11. Mendel's second law of genetics, the law of independent assortment, is one explanation of the
a. random fertilization of gametes.
b. genetic variation within species.
c. greater strength of dominant alleles.
d. final stages of gametogenesis.
____ 12. Which of the following events is an important factor in increasing variety among sexually reproducing
organisms?
a. testcross
b. gene linkage
c. crossing over
d. mitosis
____ 13. Mendel's observation that traits are inherited separately was based on which set of experiments?
a. monohybrid crosses
b. purebred crosses
c. testcrosses
d. dihybrid crosses
____ 14. Imagine two heterozygous parents. Each has a dominant allele X for brown eyes and a recessive allele x for
blue eyes. The phenotypic ratio for brown:blue eyes in their children is
____ 15. A person who has a disorder caused by a recessive allele is
a. considered a carrier of the disorder.
b. homozygous for the recessive allele.
c. unable to pass the allele to offspring.
d. certain to have offspring with the disorder.
____ 16. Gene expression is influenced by many factors. Which of the following is a factor in gene expression?
a. karyotype
b. pedigree
c. environment
d. phenotype
____ 17. Punnett Square question
____ 18. Two parents have the genotype Gg for a genetic disorder caused by a dominant allele. What is the chance
that any of their children will inherit the disorder?
____ 19. For an XX female to express a recessive sex-linked trait, she must have
a. a Y chromosome.
b. an inactivated allele.
c. two recessive alleles.
d. two dominant alleles.
____ 20. Human height occurs in a continuous range because it is affected by the interaction of several genes, making
it a ___________ trait.
____ 21. Suppose a mouse is homozygous for alleles that produce black fur and homozygous for alleles of an epistatic
gene that prevents fur coloration. What color fur will the mouse have?
____ 22. A female is born with attached earlobes, which is a recessive phenotype. What genotypes could her parents
have?
____ 23. Suppose a person is a carrier for a genetic disorder. Which of the following phrases about this person is true?
a. does not have the disorder but can pass it on
b. will develop the disorder only late in life
c. cannot pass the disorder to sons, just daughters
d. the allele is not passed on due to Y chromosome inactivation
____ 24. Some members of a family have a recessive sex-linked disorder. Which of the following statements about the
family would be true?
a. All males would have the disorder.
b. All females would be carriers.
c. Only males would have the disorder.
d. Only females would be carriers.
____ 25. What is the main reason that sex-linked disorders are most often observed in males?
a. The X chromosome only has genes for genetic disorders.
b. The Y chromosome cannot have genes that cause genetic disorders.
c. The Y chromosome cannot mask alleles on the X chromosome.
d. The X chromosome has genes only for sex determination.
____ 27. Punnett Squares (monohybrid)
____ 28. Incomplete dominance in flowers!
____ 31. What do the shaded circles represent on a pedigree?
____ 33. Suppose the first generation pea plants had flowers that were partly red and partly white instead of all pink.
The relationship would be _____________.
____ 34. How many gamete combinations could form from the following parent genotype: AaBbCCDdEEFf?
35. *Dihybrid crosses!
____ 36. If an organism’s diploid number is 12, its haploid number is ___?
____ 37. The arctic fox is blue-gray in the summer and white in the winter. What most likely influence(s) this change?
a. genes and the environment
c. the environment alone
b. dominant alleles
d. codominant alleles
____ 38. When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited ___.
a. one allele from each parent.
c. two alleles from each parent.
b. three alleles from each parent.
d. four alleles from each parent.
____ 39. If a pea plant’s alleles for height are tt, what is true of its parents?
a. Both parents were tall.
c. Both parents contributed a recessive allele.
b. Both parents were short.
d. Both parents contributed a dominant allele.
____ 40. A heterozygous tall pea plant is crossed with a short plant. The probability that an F1 plant will be tall is
a. 25%.
c. 75%.
b. 50%.
d. 100%.
____ 42. Roan cattle show codominance for the color of their hair. There are alleles for red hair and white hair. What
would you expect a heterozygous roan bull to look like if the trait showed incomplete dominance instead?
____ 43. A breed of chicken shows codominance for feather color. One allele codes for black feathers, another codes
for white feathers. The feathers of heterozygous chickens of this breed will be ___.
____ 44. Variation in human skin color is an example of ____.
a. incomplete dominance.
c. polygenic traits.
b. codominance.
d. multiple alleles.
____ 45. Cystic fibrosis is a genetic disease where males and females must inherit 2 alleles with the mutation to have
the disease. What is the mode of inheritance?
a. autosomal dominant
c. sex-linked dominant
b. autosomal recessive
d. sex-linked recessive
____ 46. If 2 parents have Type A blood types and are carriers of the recessive Type O blood type, what is the
probability that offspring will be born with Type O blood?
____ 47. Two black guinea pigs bred and produced 3 black and 2 albino offspring. Assuming no mutations, which
guinea pigs must be heterozygous?
a. all 3 black offspring
c. both albino offspring
b. 2 of the black offspring
d. both parents
____Answer questions about Pedigrees.
50 questions total!