11 Jun BIO GENETICS ASSIGNMENT
Question
1. Match each description or example (letter list) in the right-hand column to the best term in the
left-hand column (number list). Use only one description per term and one term per description.
(8 marks)
2. Choose two diseases* (a general or specific name), each involving a different one of the
following cellular components: lysosomes, membranes, or the cytoskeleton. Use only the
information in the Lewis text to describe whether the protein for each disease is structural, an
enzyme, for transport, for communication, or has other functions, and to answer one or more of
these points:
• name the related protein.
• note whether the related protein is abnormal or missing.
• describe an example of an action or consequence of the defect.
(4 marks)
*Note that diseases themselves are used here as examples of genetic concepts.
3. An individual is suspected of being a carrier of a paracentric inversion. Describe
how this inversion could be detected by chromosomal staining, and by FISH.
(3 marks)
4. Lewis describes a situation of uniparental disomy where “two identical copies of
the chromosome” (Lewis 259) were in the oocyte. Why can’t these chromosomes
be completely identical?
(2 marks)
5. A family has a child affected with trisomy 18. A trait related to a gene on
chromosome 18 has been studied in the family. The parents have normal
phenotypes for this trait. It has been determined that the mother produces only
Term Description/Example
1. progenitor cell a. related gene expression effects
2. diseasome b. aneuploidy
3. cell adhesion c. equational division
4. homologue d. pluripotent
5. secondary spermatocyte e. contact inhibition
6. nondisjunction f. euchromatin
7. exome g. differentiation
8. homeobox h. bivalent
normal protein for this trait, and the father produces equal amounts of its normal
and abnormal forms. The child with trisomy 18 has twice as much abnormal as
normal form of this protein. The gene for this protein is very close to
heterochromatic DNA of the centromere, thus reducing its crossing-over frequency.
Which parent contributed the extra chromosome to the child? Explain. In which
division did the error most likely occur? Explain.
(4 marks)
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