In shorthorn cattle, a roan cow mated with a roan bull always produces red, white, and roan claves in the ration of one red: two roan: one white.  (Roan is produced by an even mixture of red and white hairs).  If a breeder of shorthorn cattle has cows which are white and a bull which is roan: What proportion of the claves produced in his herd will be white? What proportion of the calves produced in his herd will be roan? What proportion of the calves produced in his herd will be red?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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In shorthorn cattle, a roan cow mated with a roan bull always produces red, white, and roan claves in the ration of one red: two roan: one white.  (Roan is produced by an even mixture of red and white hairs).  If a breeder of shorthorn cattle has cows which are white and a bull which is roan:

  1. What proportion of the claves produced in his herd will be white?
  2. What proportion of the calves produced in his herd will be roan?
  3. What proportion of the calves produced in his herd will be red?
  4. Starting with a roan bull and white cows, as explained above, could you eventually establish a true-breeder red herd? Explain.
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