Leader: Adam
Course: Biology 211
Supplemental Instruction
Iowa State University
Instructor: Dr. Holscher
Date:
1.
A pedigree is a family tree that describes….
The traits of parents and children across generations and is useful in understanding the inheritance of human genetic diseases.
1) Locate the carrier
2) Locate the males
3) Locate the females
4) Locate affected individuals
5) How many generations are show in this picture?
2.
Many recessive _x___-linked traits cause human diseases and disorders
3.
Fathers pass sex-linked alleles to all of their ___daughter_____, but to none of their
__sons____.
Ex: You’re researching color blindness in a family. You already know the parents phenotypes:
The husband is color blind but the wife is not. Of their eight children, half are boys and half are girls. You know that there are 2 boys with color blindness and 2 girls with color blindness. How is this possible if only their father has colorblindness?
The mother is a carrier.
Ex: You realize that studying x-linked recessive traits is so much fun and decided to do more!
You come across another family. The father is colorblind and the mother is not. One of their sons is colorblind also, except he is pissed about it! He hardly speaks to his father because he blames him for making him colorblind. With all your genetic knowledge how might you council this boy to help his relationship with his father?
His father can not give his son his x linked trait rather he got it from his mother who is a carrier.
Supplemental Instruction
1060 Hixson-Lied Student Success Center
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294-6624
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www.si.iastate.edu

Q1) 50% Q2) loci Q3)d Q4) c 5)b 6)c
Q1: A couple who are both carriers for the gene for cystic fibrosis have two children who have cystic fibrosis. What is the probability that their next child will be a carrier for this recessive genetic disorder.
Q2: The precise location of a gene on a chromosome is known as its ______ a.
Trait b.
Loci c.
Sequence d.
Character
Q3: An allele is ______. a.
A type of chromosome b.
The recessive form of a gene c.
The dominant form of a gene d.
An alternative version of a gene
Q4: A plant that has the genotype AaBbcc a.
Is triploid b.
Is homozygous at two loci c.
Is heterozygous at two loci d.
Has dominant alleles at three loci
Q5: If there are 40 chromatids in a cell, how many centromers are there? a.
10 b.
20 c.
40 d.
80
Q6: A animal’s blood cell entering the M phase of the cell cycle has 96 chromosomes.
How many chromatids does it contain? a.
46 b.
96 c.
192 d.
384
Q7: In which phase of the cell cycle are chromosomes replicated? a.
G1 phase b.
S phase c.
G2 phase d.
M phase e.
None of the above
Q8: If two chromosomes are homologous, they a.
Look similar under the microscope b.
Have very similar DNA sequences c.
Carry the same types of genes d.
May carry different versions of the same gene

e.
All the above
Q9: Checkpoints during the cell cycle are important because they a.
Allow the organelle activity to catch up to cellular demands b.
Ensure the integrity of the cell’s DNA c.
Allow the cell to generate sufficient ATP for cellular division d.
Are the only time DNA replication can occur
Q10: Which of the following is a reason for mitotic cell division? a.
Asexual reproduction b.
Gamete formation in animals c.
Multicellulairty d.
All of the above e.
Both a and c
Q11: A replicated chromosome is composed of a.
Two homologous chromosomes held together at the centromere b.
Four sister chromatids held together at the centromere c.
Two sister chromatids held together at the centromere d.
Four homologous chromosomes held together at the centromere e.
One chromosome with a centromere
Q12: Which of the following is not an even of anaphase of mitosis? a.
The nuclear envelope breaks down b.
Sister chromatids separate c.
Kinetochore microtubules shorten, pulling the chromosomes to the pole d.
Polar microtubules push against each other, moving the poles farther apart. e.
All of the above occur during anaphase.
Q13: Adam was looking at cells under his microscope for fun last Friday night. The cells are from an organism that has a diploid number of 14. In one particular case, the cell has several replicated chromosomes (sister chromosomes) aligned at the metaphase plate of the cell. Which of the following statements accurately describes this particular cell? a.
The cell is in metaphase of mitosis b.
The cell is in metaphase of meiosis I c.
The cell is in metaphase of meiosis II d.
All the above are correct e.
Both B and C are correct.
Q14: Which of the following statements accurately describes a difference between mitosis and meiosis? a.
Mitosis may produce diploid cells, whereas meiosis produces haploid cells b.
Homologous chromosomes synapse during meiosis but do not synpae during mitosis. c.
Crossing over commonly occurs during meiosis, but it does not commonly occur during mitosis d.
All of the above are correct e.
Both a and c are correct
Q15: During crossing over in Meiosis I a.
Homologous chromosomes are not altered b.
Homologous chromosomes exchange genetic material c.
Chromosomal damage occurs d.
Genetic information is lost e.
Cytokinesis occurs