A dark-red strain and a white strain of wheat are crossed andproduce an intermediate, medium-red F1. When the F1 plants areinterbred, an F2 generation is produced in a ratio of 1 dark-red:4 medium-dark-red: 6 medium-red: 4 light-red: 1 white. Furthercrosses reveal that the dark-red and white F2 plants are truebreeding. How many additive alleles are needed to produce each possiblephenotype?

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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A dark-red strain and a white strain of wheat are crossed and
produce an intermediate, medium-red F1. When the F1 plants are
interbred, an F2 generation is produced in a ratio of 1 dark-red:
4 medium-dark-red: 6 medium-red: 4 light-red: 1 white. Further
crosses reveal that the dark-red and white F2 plants are true
breeding.


How many additive alleles are needed to produce each possible
phenotype?

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