Edexcel A2 Biology 1

Welcome to your Edexcel A2 Biology 1

1. Which of the following is not an evidence for evolution?
2. Choose the word which is not very closely related to an allele.
3. Which is not a factor affecting the carrying capacity of an ecosystem?
4. Select the incorrect statement out of the following.
5. The presence of 2 genes on the same chromosome so that they tend to be inherited together and do not assort independently.
6. A change in the allele frequency of a population is ___________.
7. Select the incorrect statement regarding alleles.
8. Which of the following is an example for human blood groups?
9. Which does not describe the niche of an organism in an ecosystem?
10. Which mechanism(s) allow changes to the pool of genes?

a) Natural selection
b) Genetic drift
c) Speciation
d) Gene flow
11. Select the incorrect statement regarding ecosystems.
12. Select the incorrect pair out of the following.
13. Which is not an evidence to indicate the common ancestry shared between different species?
14. Select the incorrect statement out of the following.
15. The statement which proves the common ancestry between different species.
16. What is homozygous genotype?
17. What is heterozygous genotype?
18. Choose the correct order of formation.
19. What is a genetic drift?
20. Reasons for variation in the phenotypes of organisms in a population.

a) Environmental factors
b) Genetic factors
c) Unwillingness to change
d) Variations in the genotypes
21. Select the incorrect statement regarding sex chromosomes.
22. How many pairs of autosomes are present in a human being?
23. Which of the following does not occur if a population becomes isolated from other populations of the same species?
24. Which is not a condition for Hardy-Weinburg equilibrium?
25. An example of a sex linked disorder.