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Mendelian Inheritance Traits in Animals

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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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Please note that according to Brainmass policy, these answers are meant to be a guide to assist you with your work, rather than to substitute for your own work. Nevertheless I have attempted to provide thorough responses.

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

(b)
(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.

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Mendelian Genetics Problem Set is solved.

1. A cattle rancher discovers that one of his bulls has a great deal of muscle mass but little fat, and wishes to create a pure-breeding stock with that trait. When he breeds the bull with wild-type cows, all of the offspring are wild-type. How can the rancher create his pure stock if the allele for lean muscle is autosomal?

2. The same cattle rancher has a bull that is unusually docile and wishes to create a pure-breeding stock with that trait. When he breeds the bull with wild-type cows, all of the calves are wild-type. How can the rancher create his pure stock if the allele for tameness is sex-linked?

3. A woman with AB blood type marries a man who has type A.
--What are all the possible blood genotypes that their children could have? Remember that you don't know if he is AA or AO.
--How could you find out his genotype by:
a. Studying their children's blood phenotypes?
b. Studying his (the father's) ancestors' blood phenotypes?

4. A scientist notices that the fish that she is studying come in 3 colors. when she breeds two yellow fish, all of the offspring are yellow. When she breeds two blue fish, all of the offspring are blue. when two green fish are bred, 25% of the offspring are yellow, 25% are blue, and the rest are green.
--How would you describe the alleles for color in these fish?
--What would result if you bred a yellow fish with a blue fish?
--How about a green with a blue?

5. An enterprising pet store owner is attempting to create a pure strain of ultra-dwarf mice to sell as novelty pets. he breeds 10 pairs of ultra-dwarf mice and counts the different phenotypes seen in the offspring. (A wild-type mouse litter is 10 mice.) In the F1 generation, 50 are ultra-dwarf, and 25 are wild-type. Each time he breeds two ultra-dwarves he gets the same ratio.
--What is going on?
--Will he ever get a pure strain? If not, why?

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