Use the Punnet Sauares interactive Level 3 to conduct a cross between a man with

Question

Use the Punnet Sauares interactive Level 3 to conduct a cross between a man with normal vision and a woman with the gene for color blindness, then answer the following questions. the following questioion and a man with normal vision, XBy, and a woman who is a carrier for color blindness, X8xb mate. How many genotypes result in female offspring with normal vision? Number What percentage of female offspring will be color blind? Number If the father were color-blind, what percntage of male offsing would be color blind? Number

Explanation / Answer

The punnet squares would help to answer the questions:

XBY * XBXb father

The number of genotypes that result in female offspring with normal vision = 2

% of females that will be colorblind = 0

If female is colorblind, then % of male that would be colorblind can be found as below

father

% of male offsprings that will be colorblind will be: 1/2 *100 = 50%

Mother XB Y XB XBXB normal daughter XBY normal son Xb XBXb normal daughter( carrier) XbY affected son

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