Revision- variations

04.06.2020
10:04:18
Biology/ grade 10- Today’s topic for revision- sickle cell anaemia and selective breeding-course book- 258 and 259.
Main points:-





Selective breeding:
Selection by humans of individuals with desirable features.
Cross-breeding these individuals to produce the next generation.
Offspring with the most desirable features are chosen to continue the breeding programme and the process is repeated over a number of generations.
The largest fruit on a tomato plant might be picked and its seeds planted next year. In the next generation, once again only seeds from the largest tomatoes are planted. Eventually it is possible to produce a true-breeding variety of tomato plant that forms large fruits.
Similar principles can be applied to farm animals.