inheritance ms 4

Question 1

n fruit flies, the genes for body colour and wing length are linked. Explain what this means.

Answer 1

genes on same chromosome

Question 2

Lemmings often live in isolated populations. From time to time some lemmings move and join other populations. Explain how this movement is important in maintaining genetic variability in lemming populations which have large fluctuations in size.

Answer 2

-brings in new alleles
-increases gene pool

Question 3

During the last 700 000 years there have been long periods when the water level was much lower and Lake Malawi split up into many smaller lakes. Explain how speciation of the cichlids may have occurred following the formation of separate, smaller lakes.

Answer 3

-isolated populations
-variations due to mutations already
-different environmental factors/selection pressure
-no interbreeding
-decrease gene flow
-diff freq of allelees
.