Unit 7B Pt1 (7.1-7.4)

Natural Selection -

Unit 7 Pt1

Unit 7 Pt1 (Lessons 7.1-7.4)

HS-LS4-3: Apply concepts of statistics and probability to support explanations that organisms with an advantageous heritable trait tend to increase in proportion to organisms lacking this trait.

HS-LS4-4: Construct an explanation based on evidence for how natural selection leads to adaptation of populations.

1. Woolly mammoths and elephants have nearly identical DNA

2. Woolly mammoths still existed when King Tut ruled the Egyptians

3. Woolly mammoths were smaller than all the other mammoth species

4. The first documented woolly mammoth skeleton was discovered in 1799

5. Scientists say they could bring back woolly mammoths

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​Woolly Mammoth Facts

​Phenotypic data based on fossil and DNA evidence

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Mammoth Population

Multiple Choice

7.2 - Based on this data and your knowledge of natural selection, which explanation best explains the trends seen in the data?

• This population of mammoths appear to be in Hardy-Weinberg equilibrium since no allele frequencies are changeing over time.

• Individuals within this population of mammoths tend to only mate with individuals that have thick fur.

• Individuals with thick fur migrated into the population of mammoths, increasing the proportion of these individuals.

• Individuals with thicker fur had a survival advantage in the cold environment, allowing these individuals to reproduce more often and create more offspring.

Multiple Choice

7.2 - Different species are distinguished by their

• size.

• physical appearance.

• DNA.

• diet.

Multiple Choice

Why did the white ones start to disappear?

• The coal turned the white moths black

• They are actually different species and the white ones went extinct

• The white ones got a disease that the black ones didn't

• Predators ate the white ones at a higher rate.

Multiple Choice

According to the graph, what happened to the moths over time?

• The dark-colored moth population increased while the light-colored moth population decreased

• The dark-colored moth population decreased while the light-colored moth population increase

• Both populations increased

• Both populations decreased

Multiple Choice

7.2 - Which choice correctly identifies a positive correlation regarding the increase in black peppered moth populations in England during the late 1800s?

• the correlation between air pollution and white moth populations

• the correlations between air pollution and white moth predation

• the correlation between black moth populations and predation of black moths

• the correlation between air pollution and black moth predation

Multiple Choice

7.2 - Which statement is accurate about natural selection?

• It is a biological process that causes certain traits to be expressed less with each subsequent generation.

• It is a biological process that allows a population to have a competitive advantage in many environments.

• It is a biological process that prevents species from adapting to significant changes in their environments.

• It is a biological process that leads a population to have a widespread expression of an advantageous trait.

Match

7.2 - According to natural selection, certain _1_ can influence survival of an organism which also influences its ability to produce more _2_. It is possible that some mosquito individuals were _3_ susceptible to DDT; thus, the mosquitoes that could not tolerate DDT well died and did not produce offspring. Mosquitoes that were _4_ susceptible to DDT survived and produced offspring that were also more _5_ of DDT.

• 1

• 2

• 3

• 4

• 5

traits

offspring

more

less

tolerant

• traits

• offspring

• more

• less

• tolerant

Multiple Select

7.4 - The Tibetans & Han Chinese share several genetic traits & DNA. However, the EPAS1 gene, which increases ability of red blood cells to carry oxygen even in low oxygen environments, is only commonly found in the Tibetan population that live in higher elevations. Explain why this gene is only common in Tibetan populations? (Choose all that apply.)

• Natural selection is the process in which organisms better adapted to their environment survive and reproduce.

• The EPAS1 gene allows carriers to adapt to changing oxygen levels.

• The EPAS1 gene offers no advantage for the Han Chinese since they live in an oxygen-rich environment.

• Tibetans live in a low-oxygen environment. People with the EPAS1 gene are more likely to survive and pass on this trait to their offspring.

​Let's see who our winners are and head back to the

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