Quiz Review Ch. 2-3
Supplemental Instruction
Iowa State University
Leader:
Course:
Instructor:
Date:
Lilli Howard
BIOL/GEN 313
Dr. Rodermel/Dr. Tuggle
12/2/14
1. Draw mitosis, meiosis I or meiosis II for a 2n=6 cell. Label, for each stage, the number of
chromosomes and the number of DNA molecules. Identify the stages with crossing over
and independent segregation.
2. A student examines a thin section of an onion-root tip and records the number of cells
that are in each stage of the cell cycle. She observes 94 cells in interphase, 14 cells in
prophase, 3 cells in prometaphase, 3 cells in metaphase, 5 cells in anaphase, and 1 cell in
telophase. If the complete cell cycle in an onion-root tip requires 22 hours, what is the
average duration of each stage in the cycle? Assume no cells are in G0.
3. A cell in G1 of interphase has 8 chromosomes. How many chromosomes and how many
DNA molecules will be found per cell as this cell progresses through the following
stages: G2, metaphase of mitosis, anaphase of mitosis, after cytokinesis in mitosis,
metaphase I of meiosis, metaphase II of meiosis, and after cytokinesis of meiosis II?
1060 Hixson-Lied Student Success Center  515-294-6624  sistaff@iastate.edu  http://www.si.iastate.edu
4. If the probability of being blood-type A is 1/8 and the probability of blood-type O is ½,
what is the probability of being either blood-type A or blood-type O?
5. What are Mendel’s First and Second Laws?
6. In corn, purple kernels are dominant over yellow kernels, and full kernels are dominant
over shrunken kernels. A corn plant having purple and full kernels is crossed with a plant
having yellow and shrunken kernels, and the following progeny are obtained;
Purple, full
Purple, shrunken
Yellow, full
Yellow, shrunken
112
103
91
94
What are the most likely genotypes of the parents and progeny?
7. J. W. McKay crossed a stock melon plant that produced tan seeds with a plant that
produced red seeds and obtained the following results.
F1: 13 tan seeds
F2: 93 tan, 24 red
a. Explain the inheritance of tan and red seeds in this plant.
b. Assign symbols for the alleles in this cross and give genotypes for all the
individual plants.
8. Alkaptonuria is a metabolic disorder in which affected persons produce black urine.
Alkaptonuria results from an allele that is recessive to the allele for normal metabolism.
Sally has normal metabolism, but her brother has alkaptonuria. Sally’s father has
alkaptonuria and her mother has normal metabolism.
a. Give the genotypes of Sally, her mother, her father and her brother.
b. If Sally’s parents have another child, what is the probability that this child will
have alkaptonuria?
c. If Sally marries a man with alkaptonuira, what is the probability that their first
child will have alkaptonuria?
1060 Hixson-Lied Student Success Center  515-294-6624  sistaff@iastate.edu  http://www.si.iastate.edu