In maize (corn) plants, a dominant allele I inhibits kernel color, while the recessive allele i permits color when homozygous. At a different locus, the dominant allele P causes purple kernel color, while the homozygous recessive genotype pp causes red kernels. If plants heterozygous at both loci are crossed, what will be the phenotypic ratio of the offspring?
In maize (corn) plants, a dominant allele I inhibits kernel color, while the recessive allele i permits color when homozygous. At a different locus, the dominant allele P causes purple kernel color, while the homozygous recessive genotype pp causes red kernels. If plants heterozygous at both loci are crossed, what will be the phenotypic ratio of the offspring?
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
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:12. In maize (corn) plants, a dominant allele I inhibits kernel color,
while the recessive allele i permits color when homozygous.
At a different locus, the dominant allele P causes purple kernel
color, while the homozygous recessive genotype pp causes red
kernels. If plants heterozygous at both loci are crossed, what
will be the phenotypic ratio of the offspring?
13 The pedigree below traces the inheritance of alkaptonuria, a
biochemical disorder. Affected individuals, indicated here by
the colored circles and squares, are unable to metabolize a sub-
stance called alkapton, which colors the urine and stains body
tissues. Does alkaptonuria appear to be caused by a dominant
allele or by a recessive allele? Fill in the genotypes of the indi-
viduals whose genotypes can be deduced. What genotypes are
possible for each of the other individuals?
George
Arlene
Sandra
Tom
Sam
Wilma
Ann
Michael
Carla
Daniel
Alan
Tina
Christopher
14
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