EASY
Upper Secondary: IGCSE
IMPORTANT
Earn 100
Decide whether each of these features shows continuous variation or discontinuous variation. Foot size in humans.
Important Questions on Variation and Natural Selection
EASY
Upper Secondary: IGCSE
IMPORTANT
Decide whether each of these features shows continuous variation or discontinuous variation.
Leaf length in a species of tree.
EASY
Upper Secondary: IGCSE
IMPORTANT
Decide whether each of these features shows continuous variation or discontinuous variation.
Presence of horns in cattle.
EASY
Upper Secondary: IGCSE
IMPORTANT
For each of the examples given below, suggest whether the variation is caused by genes alone, or by both genes and environment.
- Blood group in humans
- Foot size in humans
- Leaf length in a species of tree
- Presence of horns in cattle
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
The photograph shows a small mammal called a tarsier. Tarsiers feed on insects, which they hunt at night. How is the tarsier adapted for survival in its environment?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Explain why the proportion of dark peppered moths near Manchester in Britain increased at the end of the th century.
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
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
