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Mendelian Inheritance Traits in Animals

The full problem is attached as a Word document, containing figures and pictures.

The problem concerns a dominant and a recessive gene in lizards that affect the skin color of the lizard. The frequency of these genes in two different habitats is presented, and answers are given to several questions relating to the reasons for the observed gene frequencies, and how to determine the dominant and recessive genes. The results of F1 and F2 crosses between the various lizards is given, and answers are provided to questions seeking an explanation of the observed results.


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The answer to part (a), with the mating diagrams, is included in the Microsoft Word attachment.

(i) Describe the differences in the frequency of the light and dark alleles between the species and habitats shown in Fig. 2.

Figure 2 shows that 100% of S. undulatus samples from dark soil possess dark Mclr alleles, whereas in samples isolated from white sands, approximately 55% posess dark alleles. The frequency of A. inornata individuals possessing dark alleles was very similar to the other species, approximately 95%. In contrast a much lower frequency ...

Solution Summary

This solution addresses a problem relating to the mendelian inheritance of traits in an animal species, and how those traits affect adaptation to different environments.