Inheritance Patterns in a Population Short Answer Quiz 1 (2 questions only)
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Inheritance Patterns in a Population Short Answer Quiz 1 (2 questions only)
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Question 1 of 2
1. Question
1 point(s)A student plans to investigate whether the development of insulin has affected the prevalence of Type 1 diabetes in the human population and subsequently influenced human evolution. She has access to data on Australians with diabetes extending back to 1973.
(a) Propose a suitable hypothesis for this investigation. (2 marks)
(b) Identify TWO variables that need to be controlled for this investigation and explain their importance. (4 marks)
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This response will be awarded full points automatically, but it can be reviewed and adjusted after submission.
Hint
(a)
Sample answer:
The use of insulin, by people who have Type 1 diabetes, has increased the prevalence of Type 1 diabetes in the human population.
Answer:
(b)
Criteria Marks
• Identifies TWO variables that could affect findings and explains their importance 4• Identifies TWO variables that could affect findings and outlines their importance 3
• Identifies ONE variable that could affect findings and outlines its importance 2
• Provides some relevant information 1Sample answer:
One variable the student will need to control for is the increase in the Australian population since 1973. Just counting the increase in numbers without taking into account population increases will give a biased result as even without an increase in prevalence it would be expected that the total numbers will increase as the population increases. The prevalence will need to be measured using a rate such as number of people with Type 1 diabetes per 100 000 people.Another variable that may affect results, and therefore reduce the validity of the data, is the length of time the subject has used insulin or since diagnosis. This data may also be useful if determining whether the prevalence of Type 1 diabetes is caused by more people being diagnosed or more people surviving for a longer time.
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Question 2 of 2
2. Question
1 point(s)In 1991, the body of a man was found frozen beneath a glacier in Italy. Researchers named him Ötzi. It was determined that Ötzi died 5300 years ago and that his body is the oldest mummified human body ever found. Scientists have successfully extracted DNA from the nucleus of his frozen cells.
(a) Describe the process scientists would use on a small sample of Ötzi’s DNA to obtain larger quantities of identical DNA. (3 marks)
Using gel electrophoresis, scientists discovered that there were four different types of blood on Ötzi’s clothes. Their results were as follows.
(b)
i. Which blood sample on Ötzi’s clothes belongs to Ötzi? (1 mark)
ii. Propose one hypothesis that would explain the presence of the other blood samples on Ötzi’s clothes. (1 mark)-
This response will be awarded full points automatically, but it can be reviewed and adjusted after submission.
Hint
(a) A good response included the following steps:
- heat DNA to approximately 90 degrees C
- cool to attach primers
- taq polymerase copies strands
- process is repeated many times
(b) i- Sample 3
ii- Blood samples came from other people or from animals. -