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# GeneticsProblems_Answers.pdf

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York University

Biology

BIOL 1500

Paula Wilson

Fall

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BIOL 1010Genetics practise problemsanswers 1 In rabbits coat colour is a genetically determined characteristic Some black females always produce black progeny while other black females produce black progeny and white progeny Explain how these outcomes occur In this example the allele for black coat colour is completely dominant over the allele for white coat colourEg BlackB whiteb Females who produce only black progeny are likely to have genotype BB while those who produce black progeny as well as white progeny would have genotype Bb2 How many different types of gametes can be formed by individuals of the following genotypes What are the possible gamete genotypes a AaBb4 possible combinations 12 A x 12 B14 AB 12 a x 12 B14 aB 12 A x 12 b14 Ab 12 a x 12 b14 abb AaBbCc8 possible combinations 12 A x 12 B x 12 C18 ABC 12 a x 12 B x 12 C18 aBC 12 A x 12 b x 12 C18 AbC 12 a x 12 b x 12 C18 abC 12 A x 12 B x 12 c18 ABc 12 a x 12 B x 12 c18 aBc 12 A x 12 b x 12 c18 Abc 12 a x 12 b x 12 c18 abcc AaBBcc2 possible combinations 12 A x 1 B x 1 c12 ABc 12 a x 1 B x 1 c12 aBcd AaBbcc4 possible combinations 12 A x 12 B x 1 c14 ABc 12 a x 12 B x 1 c14 aBc 12 A x 12 b x 1 c14 Abc 12 a x 12 b x 1 c14 abc1

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