Gonzo Genetics Problems

Gonzo Genetics Problems - Disclaimer on Gonzo Genetics...

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Disclaimer on Gonzo Genetics Problems: These problems are designed to help you think about genetic mechanisms. They are much more difficult than anything you will find on the exam (well, maybe one exam question will be this difficult). Don’t panic if you find them challenging! 1. The moss Megaspora is a haploid adult which produces a diploid sporophyte (formed by the fusion of two gametes). It has a single gene for height with a tall allele (T) and a short allele (t). If I cross a tall Megaspore to a short Megaspora the adult progeny will be: A. All tall B. All short C. ¼ tall and ¾ short D. ¼ short and ¾ tall E. ½ tall and ½ short 2. The moss Megaspora is a haploid adult which produces a diploid sporophyte (formed by the fusion of two gametes). It has a single gene for height with a tall allele (T) and a short allele (t). It also has a single gene for leaf color with a green allele (G) and a red allele (g). The leaf color and height genes are linked with a map distance of 25cM. A tall red Megaspora will produce gametes that have: A. All tall (T) and red (g) alleles B. All short (t) and green (G) alleles C. ½ T and g alleles, ½ t and G alleles D. ¾ T and g alleles, ¼ t and G alleles E. ¾ T and g alleles, 1/8 T and G alleles, 1/8 t and g alleles 3. The moss Megaspora is a haploid adult which produces a diploid sporophyte (formed by the fusion of two gametes). It has a single gene for height with a tall allele (T) and a short allele (t). It also has a single gene for leaf color with a green allele (G) and a red allele (g). The leaf color and height genes are linked with a map distance of 25cM. You cross a tall red Megaspore to a short green Megaspora. The progeny will be: A. All tall red B. All short green C. 3/4 tall red and ¼ short green D. 3/8 tall red, 3/8 short green, 1/8 tall green, 1/8 short red E. 1/4 tall green, 1/4 short red, 1/4 tall red, 1/4 short green
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4. In the diploid roundworm Arronax, the Dpy gene, which is on the extreme right end of chromosome I, has two alleles: a dominant wild type allele (D) and a recessive dumpy (short and fat) allele (d). On the extreme left end of chromosome I is the twister gene with a dominant wild type allele (T) and a recessive twisted (corkscrew body) allele (t). Arronax has the curious property that each pair of homologous chromosomes undergoes exactly one recombination event per meiosis (no more, no less). You cross a wild type worm that is heterozygous for both loci (dominant alleles linking in cis) to a worm that is dumpy and twisted. The progeny will be: A. All dumpy and twisted B. All normal C. ½ dumpy twisted and ½ wild type D. ¼ dumpy twisted, ¼ wild type, ¼ dumpy and ¼ twisted E. 3/4 dumpy twisted, ¾ wild type, 1/8 dumpy, 1/8 twisted 5. In the diploid roundworm Arronax, the Dpy gene, which is on the extreme right end of chromosome I, has two alleles: a dominant wild type allele (D) and a
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This note was uploaded on 04/07/2010 for the course BIOL biol 112 taught by Professor Dent during the Winter '10 term at McGill.

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Gonzo Genetics Problems - Disclaimer on Gonzo Genetics...

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