Three point crosses
Supplemental Instruction
IowaStateUniversity / Leader: / Kalyca
Course: / BIOL 313
Instructor: / Myers
Date: / 03/06/2017
  1. What is the recombination frequency equation?
  1. You testcross an individual that expresses three dominant, linked traits X, Y, and Z. You get the following offspring phenotype counts back.

XYZ / 141 / Xyz / 40
XYz / 3 / xYz / 17
XyZ / 15 / xyZ / 5
xYZ / 32 / xyz / 147
  1. What are the parental-types? Which gene is located in the middle?
  1. Construct a chromosome map using the above information. This means calculate the distances between the three genes.
  1. What does SNPs stand for and what are they? How/ why are they useful in genetic testing and analysis?
  1. How many SNPs are present in the table below

Individual / Base 1 / Base 2 / Base 3 / Base 4 / Base 5 / Base 6 / Base 7 / Base 8 / Base 9 / Base 10
1 / A / C / G / A / A / T / G / G / T / C
2 / A / A / G / A / A / T / C / T / T / C
3 / T / C / G / A / T / T / C / G / A / C
4 / A / A / G / A / T / T / C / T / T / C
5 / T / C / G / A / A / T / C / G / A / C
6 / T / C / G / A / T / T / C / G / T / C
7 / T / C / G / A / T / T / C / G / A / C