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Explain what is meant by a recessive allele.
Only expressed in phenotype if homozygous
1 of 6
Explain what is meant by co-dominance.
Both expressed in phenotype, if both present
2 of 6
Explain why observed ratios of phenotype is different from predicted ratios.
Chance related to mating; Random fusion of gametes; Small sample size; Differential mortality
3 of 6
Explain how a large number of fruit flies may have evolved on Hawaii.
Geographical isolation; No interbreeding; Range of habitats; Different selection pressures in separate populations; Mutation; Variation among fruit flies; Some more suited to environment; beneficial allele passed on; Unable to produce fertile offspri
4 of 6
Explain how natural selection may have produced the differences in frequency of snake colour variation
Variation due to mutation; Different environments; Camouflage; Advantageous alleles; Change in allele frequency in the next generation; No gene flow between populations
5 of 6
Suggest why one snake colour variation has remained the same over many generations.
Back mutation; Migration of banded snakes from mainland; Heterozygous advantage; stabilising selection; Selection pressure remains the same
6 of 6

Other cards in this set

Card 2

Front

Explain what is meant by co-dominance.

Back

Both expressed in phenotype, if both present

Card 3

Front

Explain why observed ratios of phenotype is different from predicted ratios.

Back

Preview of the front of card 3

Card 4

Front

Explain how a large number of fruit flies may have evolved on Hawaii.

Back

Preview of the front of card 4

Card 5

Front

Explain how natural selection may have produced the differences in frequency of snake colour variation

Back

Preview of the front of card 5
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