Chapter 5, Problem 20P

$\text{Neurospora}$ with the genotype $\text{a+a}$ form tetrads in thefollowing frequencies:

$\begin{array}{cc}Tetrad& Number\\ a^{+}{a}^{+}aa& 192\\ aa{a}^{+}{a}^{+}& 208\\ a{a}^{+}a{a}^{+}& 23\\ a{a}^{+}{a}^{+}a& 27\\ a^{+}a{a}^{+}a& 29\\ a^{+}aa{a}^{+}& 21\\ & 500\end{array}$

a. What is the distance between the gene and the centromere?

b. Diagram the meiosis producing the tetrad class $\text{a a a+a+}\text{.}$

c. Diagram the meiosis producing the tetrad class $\text{a+a a a+}\text{.}$