18.2. Genetic modification
A subsection of Biology, 5090, through 18. Biotechnology and genetic modification
Listing 10 of 39 questions
Farmers in many countries, including the United States of America (USA), keep cows to produce milk. This milk is then sold for human consumption. Table 6.1 shows how the yearly average milk production per cow in the USA changed over a period of 60 years. Table 6.1 year mass of milk produced per cow / kg per year Between the years 1970 and 2010, a farmer in the USA always had 250 cows producing milk on his farm. Use the data in Table 6.1 to calculate the increase in milk production by 250 cows between the years 1970 and 2010. Express your answer in standard form. Space for working. kg per year One reason for the pattern shown by the data in Table 6.1 is the use by farmers of artificial selection to breed cows that produce more milk. This is an example of selective breeding. Use this example to describe the main stages in the process of selective breeding. Research has shown that 95% of cows used to produce milk in the USA are fed crop plants that have been produced by genetic modification. These crop plants have been produced to provide the cows that eat them with additional vitamins. Outline the stages in the genetic modification process used to produce these crop plants. Genetic modification has been used to change crop plants in other ways. One example of this is the production of crop plants that contain a chemical to make them resistant to insect pests. Outline two potential risks of growing these crops.
5090_w24_qp_22
THEORY
2024
Paper 2, Variant 2
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Questions Discovered
39