IB myp 4-5 Biology – Practice Questions- All Topics
Topic :Biotechnology-Genetic modification
Topic :Biotechnology– Weightage : 21 %
All Questions for Topic : Genetic modification,Cloning,Ethical Implications,Genome mapping and application,3D tissue and organ printing
Question
b .Discuss and evaluate the use of genetically modified fish farming to solve the problem of decreasing fish stocks. In your answer, you should include:
- positive and negative environmental impacts of fish farms
- positive and negative economic or social impacts of fish farms
- a suggestion of the best location for fish farms with justification
- a concluding appraisal giving your opinion.
▶️Answer/Explanation
Ans:
Question:
Explain how the researchers could discover whether a gene was needed for the bacterium to survive and reproduce successfully in the laboratory.
▶️Answer/Explanation
Ans: Eliminate a gene artificially; attempt to culture the microbe lacking the gene; if the gene isn’t vital the bacterium will grow and multiply to form a visible colony.
Question:
The Holstein breed of cattle is widely used for milk production. In order to produce milk, each cow must have a calf every year. Holsteins have a black head and black coat with white patches.
Hereford cattle are reared for beef. They have an all-white head and a red coat with no white patches. Many Holstein cattle are artificially inseminated with semen from Hereford bulls. The progeny all have a white head, a black coat and no white patches. Discuss the possible outcome if these Holstein-Hereford crosses were bred together.
▶️Answer/Explanation
Ans: White head due to a dominant allele so 3:1 ratio of white to coloured head; the expected ratio for coat colour is 3 black: 1 red; 3 no white patches: 1 with white patches; all combinations of these traits are possible assuming that the three genes are unlinked; chance of offspring with a red coat and white patches plus a coloured head is 1 in 64.