Question

In dragons, green skin color (G) is dominant to purple skin color (g), and long horns (L) are dominant to short horns (l). Consider a mating between a heterozygous green, long-horned dragon and a purple, short-horned dragon. What phenotypes and genotypes, and in what ratios, would you expect from this mating if genes sort independently (i.e. follow Mendel's law of independent assortment)? Draw a Punnett square to support your answer. Repeated breeding of these two dragons results in a total of 100 dragon babies. The phenotypes of the offspring are as follows: Green, long-horned: 44 Green, short-horned: 9 Purple, long-horned: 6 Purple, short-horned: 41 Based on this observed data, what is the recombination frequency of skin color and horn length genes? Show your work. Compare the expected phenotypic ratios (your answer from part a.) with the observed data reported in part b. Do you suspect genes for skin color and horn length to be linked or sort independently? Why or why not? Later dragon crosses resulted in the following frequencies of gene recombination among these gene pairs: Horn length - Tail shape: 30% Tail shape - Eye color: 5% Skin color - Tail shape: 15% Eye color - Skin color: 10% Use the information above and your answer in part (b.) to map the relative locations of these genes along a chromosome:

          In dragons, green skin color (G) is dominant to purple skin color (g), and long horns (L) are dominant to short horns (l). Consider a mating between a heterozygous green, long-horned dragon and a purple, short-horned dragon.

What phenotypes and genotypes, and in what ratios, would you expect from this mating if genes sort independently (i.e. follow Mendel's law of independent assortment)? Draw a Punnett square to support your answer.

Repeated breeding of these two dragons results in a total of 100 dragon babies. The phenotypes of the offspring are as follows:

Green, long-horned: 44
Green, short-horned: 9
Purple, long-horned: 6
Purple, short-horned: 41

Based on this observed data, what is the recombination frequency of skin color and horn length genes? Show your work.

Compare the expected phenotypic ratios (your answer from part a.) with the observed data reported in part b. Do you suspect genes for skin color and horn length to be linked or sort independently? Why or why not?

Later dragon crosses resulted in the following frequencies of gene recombination among these gene pairs:
Horn length - Tail shape: 30%
Tail shape - Eye color: 5%
Skin color - Tail shape: 15%
Eye color - Skin color: 10%

Use the information above and your answer in part (b.) to map the relative locations of these genes along a chromosome:

Added by Jessica G.

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