HITCHHIKER'S THUMB: The distal (last) joint of the thumb can be bent back to form a 45 degree angle with the proximal joint (attached to your hand) if you are homozygous recessive (hh) for this trait. Michael has a well-developed hitchhikers thumb, but neither of his parents show the trait. If his parents have another child, what is the probability that he/she will also have a hitchhikers thumb?

Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter3: Transmission Of Genes From Generation To Generation
Section: Chapter Questions
Problem 2QP: Crossing Pea Plants: Mendels Study of Single Traits Of the following, which are phenotypes and which...
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HITCHHIKER'S THUMB: The distal (last) joint of the thumb can be bent back to form
a 45 degree angle with the proximal joint (attached to your hand) if you are
homozygous recessive (hh) for this trait.
Michael has a well-developed hitchhikers thumb, but neither of his parents show the
trait. If his parents have another child, what is the probability that he/she will also
have a hitchhikers thumb? 

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