Mendelian Genetics
Study Questions

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  1. A monohybrid cross is made between two rats which are heterozygous for eye color (black eyes are dominant, red eyes are recessive). What would the phenotypic ratio be for eye color in the offspring from this cross?
  1. There are several possibilities depending on which sex has red eyes.
  2. All will have black eyes.
  3. All will have red eyes.
  4. On the average, three will have black eyes for every one with red eyes.
  1. The following dihybrid cross is made: TtRr X TtRr (T=tall, t=short, R=red, r=white). On the average, how many short white individuals will result from this cross?
  1. 9/16
  2. 3/16
  3. 1/16
  4. 1/8
  1. Which of the following are true concerning Mendel?
  1. He selected true breeding varieties of pea plants and used well-defined characteristics.
  2. He was thoroughly familiar with the structure of DNA and the function of meiosis.
  3. He conducted reproducible experiments and had a large sample size.
  4. He described the principles of segregation and independent assortment
  1. Phenotype:
  1. represents what's expressed.
  2. always completely reflects the genotype
  3. is dictated by the genotype.
  1. The principle of segregation is based on the separation of homologous chromosomes during anaphase I of meiosis.
TRUE
FALSE
  1. The principle of independent assortment is based on the separation of chromatids during anaphase II of meiosis
TRUE
FALSE
  1. Mendel was aware of genes and the important role which DNA plays in determining traits.
TRUE
FALSE
  1. The offspring from a cross between a homozygous tall pea plant (TT) and a homozygous dwarf pea plant (tt) would all demonstrate the tall phenotype.
TRUE
FALSE
MATCHING:
(use lower case; incorrect responses will be replaced with a "?".)

9. genotype a. TR, tr OR Tr, tR

10. phenotype b. TT

11. independent assortment c. tall (Tt)

12. segregation d. tt

13. dominant e. anaphase I

14. recessive f. tall and short (Tt)
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