EASY
Upper Secondary: IGCSE
IMPORTANT
Earn 100
What is meant by stabilizing selection? Give one example.
Important Questions on Variation and Natural Selection
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Draw a genetic diagram to show how two heterozygous parents can have a child with sickle cell anaemia?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Imagine you are a farmer with a herd of dairy cattle. You want to build up a herd with a very high production of milk. You have access to sperm samples from bulls, for each of which there are records of the milk production of his offspring. What will you do?
EASY
Upper Secondary: IGCSE
IMPORTANT
Describe how you could use artificial selection to produce a new variety of wheat which is naturally resistant to yellow rust?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
When resistant varieties of wheat are produced, it is found that after a few years they are infected by yellow rust again. Explain how this might happen.
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
How could the growing of resistant varieties reduce pollution?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Copy and complete the following sentences, using words from the list. You may use each word once, more than once or not at all.
(adapted, continuous, discontinuous, environment, genes, genus, matched, mutation, selection, sex, species)
Variation can be defined as differences between individuals of the same _____. Sometimes, the differences are clear-cut, and each individual fits into one a small number of defined categories. This is called _____ variation. This kind of variation is caused by the organisms' _____. In other cases, the differences have no definite categories. This is called _____ variation.
Cell division by mitosis does not usually produce variation unless there is a change in the DNA, called _____. Most mutations are harmful, because they make an organism less well _____ to its environment.
EASY
Upper Secondary: IGCSE
IMPORTANT
Distinguish between each of these pairs of terms.
Genetic variation, environmental variation
EASY
Upper Secondary: IGCSE
IMPORTANT
Distinguish between each of these pairs of terms.
Continuous variation, discontinuous variation.
