You are given a mouse with short ears and a straight tail from a pure breeding strain and another mouse with long ears and a curly tail, also from a pure breeding strain. When you cross them the offspring all have short ears and straight tails. When you cross these offspring to one another the results in the next generation exhibit all four possible combinations of ear size and tail shape (short & straight, long & curly, short & curly, long & straight) with short and straight being the most common and long and curly being the least common.
If you wanted to test for linkage which of the following types of mice would you use in a test cross with the second generation?
a. homozygous for straight tail and short ear
b. homozygous for curly tail and long ear
c. homozygous for short tail and long ear
d. homozygous for curly tail and short ear
e. heterozygous for both
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Our tutors have indicated that to solve this problem you will need to apply the Chromosomal Theory of Inheritance concept. You can view video lessons to learn Chromosomal Theory of Inheritance. Or if you need more Chromosomal Theory of Inheritance practice, you can also practice Chromosomal Theory of Inheritance practice problems.
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