Paper 2 revision

Open Ended

In your own words, what is homeostasis?

Open Ended

LABEL the structures indicated by the lines. ADD AN ARROW to the diagram to show the direction with which a nerve impulse would be passed through this cell. CIRCLE the area that would be considered the input region. DRAW A RECTANGLE around the area that would be considered the conducting region. PLACE A STAR next to the area that holds the majority of the cell’s organelles.

Open Ended

Explain the process of a reflex action as illustrated in the images.

Multiple Choice

This structure releases what hormones?

• insulin and glucagon

• calcitonin and estrogen

• Parathyroid hormone and antidiuretic hormone

• epinephrine and testosterone

Open Ended

How does insulin help control high blood sugar levels in the body? (i.e. maintain homeostasis)

Open Ended

Explain the difference between hormonal coordination and reflex actions in terms of speed and duration of response.

Multiple Choice

What role does the nervous system play in homeostasis?

• It allows us to detect changes in our environment

• It regulates blood glucose levels

• It controls hormonal responses

• It is responsible for reflex actions

Fill in the Blanks

What is an organized picture of all of an organism’s homologous chromosome pairs lined up with each other?

Reorder

Place these events in the proper order:

• Homologous chromosomes pair up and genetic info crosses over

• Homologous pairs are separated

• Two haploid cells are created

• Sister chromatids separate

• Four haploid cells are created

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Multiple Choice

In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?

• Tall = T
  Short = S
• Tall = T
  Short = t
• Tall = t
  Short = T
• Tall = TT
  Short = tt

Open Ended

How does independent assortment cause genetic variation?

Multiple Choice

What type of mutation is shown in the diagram?

• Point mutation - missense

• Frameshift Mutation - deletion

• Frameshift Mutation - addition

• Point mutation - nonsense

Categorize

Options (6)

Type of gene (letters)

Physical expression of a gene

BB, Bb, bb

Brown eyes or blue eyes

HH, Hh, hh

Horns and no horns

Organize these options into the right categories

Genotype

Phenotype

Match

Match the following

• Allele

• Gene

• Phenotype

• Genotype

A variant form of a gene

A segment of DNA that codes for a protein

Observable traits of an organism

The genetic makeup of an individual

• A variant form of a gene

• A segment of DNA that codes for a protein

• Observable traits of an organism

• The genetic makeup of an individual

Match

Match the following

• Allele

• Gene

• Chromosome

• DNA

A variant form of a gene

A segment of DNA that codes for a protein

Structures within cells that contain genetic material

The molecule that carries genetic instructions

• A variant form of a gene

• A segment of DNA that codes for a protein

• Structures within cells that contain genetic material

• The molecule that carries genetic instructions

Open Ended

The graph shows the frequency of two traits, 1 and 2, in a population.

Part A: Use information from the circle graph to infer which trait is most likely favored by natural selection.

Part B: Explain how natural selection could lead to the trait distribution shown in the circle graph.

Part C: Scientists predict that over time 0% of the population will have trait 2. Explain why this change in trait distribution could result in negative consequences for the population.

Open Ended

What is evolution or survival of the fittest?

Multiple Choice

Evidence shows that the wolf is the ancestor to all of the breeds of dogs shown below. How did this variation arise in a relatively short period of time?

• A.  Genetic manipulation
• Natural selection
• Random chance
• Selective breeding

Open Ended

Considering the process of selective breeding in agriculture, what are the primary advantages and disadvantages we need to consider?

Open Ended

Increased food production is essential to feed the growing human population. Some experts suggest that technology will be the answer. One application of technology is to clone a single plant to produce large numbers of it to grow as a single crop.

Explain how using cloning to produce a single crop could actually lead to a loss of the entire crop.

Multiple Choice

What is a community?

• One individual of a species

• a group of individuals living together in an area

• all the different populations living together in an area

• different communities and their physical environment

Multiple Choice

In this photo, what is an abiotic factor?

• Deer

• Grass

• rain

Multiple Choice

The table shows the main food source of different organisms that make up a food chain. Which set of trophic levels correctly describes the organisms?

Multiple Choice

A researcher concludes from a 10-year study that the biodiversity of an ecosystem had increased. Which set of observations represents evidence for this claim?

• There were more niches and greater stability in the ecosystem.

• There were more niches and less energy lost as heat in the ecosystem.

• There were fewer niches for decomposers and less stability.

• There were fewer niches for consumers and greater cycling of materials.

Multiple Choice

What are the three conservation methods mentioned in the image?

• Breeding Programmes

• Habitat Protection

• Education

• Pollution Control

Open Ended

Explain what we mean by "Artificial Selection" vs. "Natural Selection".

Give an example of each.

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident