Question

Question 8 (0.66 points) You are studying a genetic system involving two unlinked genes affecting the color of ascospores in Sordaria fimicola. The X gene is located at a genetic distance of 6 CM and the Y gene is located at a genetic distance of 41 CM. In the general genetic model, what would be the EXPECTED FREQUENCY of (1) PD asci (submission box 1), NPD asci (box 2) and Tasci (submission box 3)? Each numerical value should contain exactly two digits after the decimal point. The second digit after the decimal point should be rounded as needed. Enter the zero before the decimal point and use a dot to indicate the decimal point, not a comma. Also remember that a frequency value should be between 0 and 1. A putative value of 0.176 should be typed in as 0.18.

Answer 1

The observed PD asci are (24 +25) ana the observed NPD (30+ 21). If the genes are unlinked, the numbers should ne divided by 2 i.e., PD~ NPD

Degree of Freedom = 1

The two unlinked genes will affect the probability of cross overrs occuring together is the product of their independent probabilities. Thus, the probability of multiple crossover is small if genes are close together, but increases rapidly as genes are further apart.