Unit 5 Evolution Test Short Answer

1. A student is given four components of evolution, shown in the four boxes here. Which statements can be formed using the terminology shown here to accurately describe the evolution within a species?

• individuals undergo evolution depending on the genetics of the populoation
• populations have individuals with constantly changing genetics that lead to evolution
• individuals have different genetics, leading to the evolution of populations
• populations are able to undergo evolution so they can create the specific organism that they want

2. Webbed feet is a recessive trait in iguanas. The chart shows the prevalence of alleles for webbed feet over three generations. Analyze the data for evidence of evolution. Choose the 3 correct statements supported by the data.

• natural selection is occurring
• the iguanas probably moved onto land
• webbed feet became more common over time
• there is a selective advantage for iguanas with webbed feet
• there were equal numbers of iguanas with and without webbed feet in generation 2

3. The genotype for webbed feet is __________.

• homozygous dominant
• homozygous recessive
• heterozygous
• incomplete dominant
• co-dominant

4. If the trait for webbed feet is recessive, why does it become 90% prevalent by the 3rd offspring generation?

• this allows for larger foot size thus letting them move faster through the sandy environment than other individuals
• the webbed feet iguanas must have an environmental advantage over the individuals who do not, therefore allowing them to be better fit for the environment
• this would not have an affect on the population overall, the data is skewed and/or incorrect
• all of the above

5. If generation on has a 50% non-webbed and a 50% webbed offspring ratio, what must the genotypes of the first two parents be? _____ x _____

• WW x ww
• Ww x ww
• WW x WW
• WW x Ww