General Biology Hub

LECTURE LEARNING TOOLS

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LECTURE OBJECTIVES (instructional goals)

AT THE END OF THIS LECTURE, YOU SHOULD BE ABLE TO:

1. Differentiate between genotype and phenotype.
2. Work single-factor (monohybrid) genetic problems dealing with traits that show dominance and recessiveness.
3. Explain the Principle of Segregation.
4. Explain the Principle of Independent Assortment.
5. Be able to design a Punnett square to predict reproductive outcomes from different parents.
6. Explain how environmental conditions influence an organism’s phenotype.
7. Define selected key terms.

Nondisjunction is the abnormal distribution of:

• 1. _________________________________________________________

Alternative forms of a gene for a particular characteristic (trait):

• 2. _________________________________________________________

An allele that express itself and masks the effect of the other homologous allele:

• 3. _________________________________________________________

In simple genetic inheritance, with two alleles only, the trait is determined by:

• 4. _________________________________________________

• 5. _________________________________________________

• 6. _________________________________________________

List two natural traits inherited as a simple genetic inheritance:

• 7. _________________________________________________

• 8. _________________________________________________

List two genetic disorders inherited as a simple genetic inheritance:

• 9. _________________________________________________

• 10. _________________________________________________

List two complex genetic “gene pattern” traits:

• 11. _________________________________________________

• 12. _________________________________________________

List two complex genetic “chromosomal pattern” traits:

• 13. _________________________________________________

• 14. _________________________________________________

Use the punnett square to solve the following genetic problem:

A healthy person mates with a carrier of Huntington Disease, give the probability of these two parents having a child with the disease?

• 15. genotypes: _____________________________________________________________________________

• 16. phenotypes: _____________________________________________________________________________

• 17. Give an example of a trait influenced by the environment: ________________________________________

• 18. A couple who both are carriers of cystic fibrosis -- an autosomal recessive genetic disorder affecting chloride transport between certain cells and the extracellular fluid, have two children who have cystic fibrosis. What is the probability that their next child will have cystic fibrosis?

a. 0%
b. 25%
c. 50%
d. 75%
e. 100%

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General Biology Hub

LECTURE LEARNING TOOLS

Page created 29.XII.1997, last updated 09.IX.2000. © 1997, 1998, 1999, 2000. Jan A. Nilsson, desertbruchid@hotmail.com