A farmer wants to selectively breed goats for high milk yield. Goat K received more feed than goat L and produced more milk. Both goats were bred with the same male. All their daughters were kept in the same housing and given the same amount of feed.
| mother | mother's milk yield in one year (litres) | mean milk yield of daughters in one year (litres) |
|---|---|---|
| K | 720 | 640 |
| L | 610 | 710 |
Which conclusion is best supported by these results?
Goat L is the better parent to use because her daughters had the higher mean milk yield under the same conditions.
Goat L is the better parent to use because receiving less feed caused her daughters to produce more milk.
Neither goat is suitable because an inherited milk yield would be the same in each mother and her daughters.
Goat K is the better parent to use because she had the higher milk yield when the mothers were compared.
100 exam-style questions on Edexcel GCSE Biology 4.3 Selective breeding and genetic modification, covering 4.3.1 Selective breeding and its impact, 4.3.2 Tissue culture, 4.3.3 Genetic engineering overview, 4.3.4 Main stages of genetic engineering, 4.3.5 Advantages and disadvantages of GM organisms, 4.3.6 Agricultural solutions for a growing population, and 4.3.7 Evaluating genetic engineering and breeding. Each one has a worked solution and a mark scheme showing where the marks go.