SBI 3UI Unit 3 Review: Genetic Processes
Big Ideas:
 Genetic and genomic research can have social and environmental implications.
 Variability and diversity of living organisms result from the distribution of genetic
materials during the process of meiosis.
Overall Expectations: You should be able to…
 evaluate the importance of some recent contributions to our knowledge of
genetic processes, and analyse social and ethical implications of genetic and
genomic research
 investigate genetic processes, including those that occur during meiosis, and
analyse data to solve basic genetics problems involving monohybrid and dihybrid
crosses
 demonstrate an understanding of concepts, processes, and technologies related
to the transmission of hereditary characteristics.
Try these questions:
1. Which phase of meiosis is shown here?
a) Prophase I b) prophase II
c)
e) interphase
metaphase I
d)
metaphase II
2. Which of the following processes contributes to genetic variation?
a) cloning
b) mitosis
c) crossing over
d) cytokinesis
3. What is the predicted phenotypic ratio of the offspring from a dihybrid cross between
two individuals that are heterozygous for both traits?
a) 3:1
b) 9:3:3:1
c) 1:3
d) 1:2:2:1
4. What is the goal of therapeutic cloning?
a) to produce genetically identical organisms
b) to produce multiple copies of genes for mass production
c) to produce multiple copies of genes for further research
d) to produce identical cells to treat disease
e) to repopulate endangered species
5. What are haploid and diploid cells? Where is each cell type found?
6. Describe what the terms dominant and recessive mean. How are they used to
describe the forms of a trait at the genotype level and at the phenotype level?
7. What is the difference between a gene and an allele?
8. Determine the probability of a hemophiliac child being born when neither the father
nor mother has hemophilia, but the mother’s father has hemophilia. Is there any
chance that their daughters will be affected? Why or why not?
9. From the following blood types, determine which baby belongs to which parents.
Explain your choices.
 Baby 1 – blood type O
 Baby 2 – blood type B
 Mr. Jones – blood type A
 Mrs Jones – blood type A
 Mr. Guttierez – blood type A
 Mrs. Guttierez – blood type AB
10. This pedigree traces a genetic disorder in a
family.
Is this a dominant or recessive
inheritance pattern? Explain why, and show the
genotypes and phenotypes of all the individuals
in the pedigree.
11. Variability and diversity of living organisms result from the distribution of genetic
materials during the process of meiosis. Crossing over and independent assortment
play an important role in distribution of genetic material. Draw labeled diagrams to
show how.
12. Stem cell research has led to many ground-breaking discoveries, as well as thoughtprovoking controversies. Describe some of the controversy surrounding stem cell
research and how new research has managed to reduce the controversy.
13. How can having your genetic profile determine pose both potential risks and
benefits? Does this development of genetics research suggest a need for new
social and political policies?
14. A long-haired cat and a short-haired cat have a litter of kittens. The litter has both
short-haired and long-haired kittens. If the allele for short hair is dominant to the
allele for long hair, determine the genotypes of the parents. Explain your answer.
15. In mice, the allele for black fur is dominant to the allele for brown fur, and the allele
for deafness is recessive to the allele for normal hearing. If a mouse that is
heterozygous for both traits is crossed with a homozygous black mouse carrying the
deafness allele, determine the probability of producing a deaf black mouse.
16. Tim and Christine have freckles (a dominant trait that is not sex-linked), but their son
Michael does not. Use a Punnett square to show how this situation is possible. Tim
and Christine are expecting another baby. What is the probability of this child having
freckles?
17. Suppose a chicken farmer wishes to produce a blue chicken from his flock of
Andalusians. He has a black rooster and several black and white hens (black and
white are incompletely dominant). Which birds should the farmer cross in order to
produce a blue Andalusian chicken? Draw a Punnett square to illustrate the cross.