1 markAfrican lions face challenges in their natural habitat, including competition for food, a hot climate and limited water sources. These factors contribute to population regulation. Which of the following best describes these challenges in the context of natural selection?
Artificial selection pressures
Evolutionary fitness indicators
Environmental factors
Phenotypic variations
Did this page help you?
1 markA breeder is interested in improving the sprinting speed of racehorses. They test the speed of two groups of horses over five generations. Group A consists of horses selectively bred for sprinting, while group B consists of randomly selected horses. The table below shows the average sprint speed for each group across five generations:
Generation | Average sprinting speed (m/s) | |
|---|---|---|
Group A | Group B | |
1 | 15 | 14 |
2 | 16 | 14 |
3 | 17 | 14 |
4 | 18 | 15 |
5 | 19 | 15 |
Which of the following conclusions can be drawn from the data?
All offspring that are selectively bred have alleles for fast sprinting speed.
Random breeding increases sprinting speed at the same rate as selective breeding.
Selective breeding increases sprinting speed at a higher rate than random breeding.
Sprinting speed does not change over time in randomly bred horses.
Did this page help you?