Monday, May 7, 2012

Bio 120 review for the final

Biome Review

1. What are two important factors in determining what type of Biome one will find in a given area?

2. What causes the seasons here in North America?

3. What are three strategies plants have developed to survive in the cold dry,and sometimes dark conditions of the Tundra?

4. What kind of adaptations have animals developed to survive in:
A. The tundra
B. The deserts

5. What is a rain shadow, and how does it account for different plant communities occurring at the same latitude, but on opposites sides of a mountain range?

6. In what biomes does fire play an important role, and what is this role?

7. How are coniferous forests different from deciduous forests?

Climate Change

1. What types of gases trap heat in the atmosphere?

2. What are the sources of these gases?

3. What are some consequences of global warming?

4. What can be done to slow the rate of the current warming trend?

Genetics review

1. Which of Mendel's laws addresses homologous chromosomes separating from each other during meiosis?

2. What word (or phrase) describes each of the following genotypes? TT Tt tt

3. What is the difference between genotype and phenotype?

4. Two normal parents have a child with a recessive disorder. What are the genotypes of each parent?

5. Dad has AB blood, and mom has BO blood. What are the possible blood types of their children?

6. In pea plants purple flower color (P) is dominant to white (p). If a plant heterozygous for purple flowers is crossed with a plant with white flowers, what proportion of the offspring will have white flowers?

7. Colorblindness is an X linked recessive trait. Susan carries the gene for colorblindness, and her husband is not colorblind. What is the chance their son is colorblind? What is the chance their daughter is colorblind?

8. In one species of flowering plants there is some diversity in flower color. Some plants have blue flowers, some have red, and others have purple flowers. What type of inheritance do you suspect controls this trait, and why?

9. Huntington's Disease is caused by a dominant allele (H). Mark's mother is heterozygous for the allele, but his father has no evidence of the disease in his family. What is the chance that Mark has the allele for Huntington's Disease?

10. The disease sickle cell anemia is caused by a recessive allele. Two parents who are heterozygous for the allele have a child. What is the chance this child has the disease?

11. What does Mendel's law of independent assortment describe?

12. What is the most common genetic disease caused by a single gene mutation?

13. In peas, the tall allele is dominant to short, and purple flowers are dominant to white. If a short plant heterozygous for purple flowers is crossed with a tall plant that is heterozygous for height, but homozygous recessive for flower color, what proportion of the offspring from this cross will be tall plants with purple flowers?

14. How is co-dominance different from incomplete dominance?

15. A biologist cross breeds a newly discovered species of flowering plant and notices the following:

Red flowering plant X red flowering plant: sometimes all offspring are red, and in other crosses with different red flower plants sometimes the offspring are red and others are blue flowering.

Blue flowering plant X blue flowering plant: offspring are always blue flowering

Blue flowering X red flowering: sometimes all offspring are red, and in other crosses with different plants both blue flowering plants and red flowering plants are produced.

Assuming flower color is controlled by one pair of alleles, which allele is dominant and which is recessive, or is this a case of incomplete dominance?

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