Species & Speciation UPDATED ACTUAL QUESTIONS AND CORRECT Answers!!!!! (2026/2027)

Species & Speciation UPDATED ACTUAL QUESTIONS

AND CORRECT Answers!!!!! (2026/2027)




Explain how the speciation of cichlids may have occurred

following the formation of separate, smaller lakes (4) -

ANSWER--1. Isolation of two populations

2.variation already present due to mutations

3. Different environmental conditions

4. Leads to selection of different features and therefore

different alleles

5. Different frequency of alleles no interbreeding

, Many species of cichilds are similar in size and, apart from

their colour, in appearance. Suggest how the the variety of

colour patterns displayed by these cichilds may help to

maintain these fish as separate species. (2) - ANSWER--

1. Selection of mate dependent on colour pattern

2. Prevents interbreeding/ keeps gene pool separate




Explain how natural selection could produce a copper-

tolerant population in the mine waste (4) - ANSWER--1.

Variation in alleles present in original population

2. Copper-tolerant individuals more likely to survive

3. Pass on favourable genes

4. Increase in frequency of copper tolerant alleles