PS 1 answers, probs 5+6 - How many genes are involved in...

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Problem 5. It’s a very well known fact that most dragons do not breathe fire, and it’s also well known that alleles that enable fire breathing are recessive to the wild-type Sweet Breath phenotype. However, it’s unclear how many different genes when mutated cause the fire breathing phenotype. To answer this question you use four different strains of dragon and perform a series of crosses. Your strains are the Hungarian Horntail (Strain A), the Norwegian Ridgeback (Strain B), the Romanian Longhorn (Strain C), and the Swedish Shortsnout (Strain D). All strains are true breeding for a single homozygous recessive mutation that allows them to breathe fire. Cross #1 Hungarian Horntail (A) X Norwegian Ridgeback (B) = F1: All Sweet Breath Cross #2 Romanian Longhorn (C) X Swedish Shortsnout (D) = F1: All Sweet Breath Cross #3 Swedish Shortsnout (D) X Norwegian Ridgeback (B) = F1: All Firebreathing Cross #4 Romanian Longhorn (C) X Hungarian Horntail (A) = F1: All Firebreathing
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Unformatted text preview: How many genes are involved in creating a firebreathing phenotype? Group the dragons (A, B, C, and D) as to which contain mutations in the different genes. There are 2 genes, A and C have mutations in the same gene, as do B and D. Problem 6. A) Construct a map of the deletions that fits the data in this table 1 _________ 2 __________ 3 _______________ 4 ______ 5 ___________________ B) Draw a map that includes both the deletion and point mutations. 1 _________ 2 __________ 3 _______________ 4 ______ 5 ___________________ c e,d a b C) Why do d and e point mutants yielded the same result? Which of the following are the possible explanations for this? Circle all the possible answer. i. They are point mutations in the same nucleotide ii. They are not in the same complementation group iii. They are point mutations in different nucleotides but they both overlap with the same deletion mutants. iv. It just happened by chance that they yielded the same result...
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