EXTEND YOUR UNDERSTANDING WITH ADDITIONAL TRC PROBLEMS Total fingerprint ridge count exemplifies a polygenic inheritance pattem. Penrose (1969) and others have suggested that a minimum of seven gene loci contribute to TRC, but a four-locus model is hypothesized in the problems that follow. Thus, AABBCCDD represents the genotype for maximum ridge count and aabbccdd symbolizes the genotype for the minimum ridge count. Assume that each active (dominant) allele adds 12 ridges to the TRC of the male and 9 to the TRC of the female and that having the genotype aabbccdd produces a baseline TRC of 80 for males and 70 for females. (one answer is given below to calify any issues with the instructions). 1. Predict the TRC for each of the following individuals. Genotype Male Female AABBCCDD AabbccDd answer = 104 AABBCCDD aaBbCCDd 11 Genetics 2. Write the genotypes of both parents (parental cross) who are heterozygous for all four genes (tetrahybrid cross). Write the genotype of the child (from the cross above in Question 2) who has the maximum number of active alleles possible. a. What are the TRCS for the parents and their child (assume that the child is a male)? Parents: Child:
EXTEND YOUR UNDERSTANDING WITH ADDITIONAL TRC PROBLEMS Total fingerprint ridge count exemplifies a polygenic inheritance pattem. Penrose (1969) and others have suggested that a minimum of seven gene loci contribute to TRC, but a four-locus model is hypothesized in the problems that follow. Thus, AABBCCDD represents the genotype for maximum ridge count and aabbccdd symbolizes the genotype for the minimum ridge count. Assume that each active (dominant) allele adds 12 ridges to the TRC of the male and 9 to the TRC of the female and that having the genotype aabbccdd produces a baseline TRC of 80 for males and 70 for females. (one answer is given below to calify any issues with the instructions). 1. Predict the TRC for each of the following individuals. Genotype Male Female AABBCCDD AabbccDd answer = 104 AABBCCDD aaBbCCDd 11 Genetics 2. Write the genotypes of both parents (parental cross) who are heterozygous for all four genes (tetrahybrid cross). Write the genotype of the child (from the cross above in Question 2) who has the maximum number of active alleles possible. a. What are the TRCS for the parents and their child (assume that the child is a male)? Parents: Child:
Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter5: The Inheritance Of Complex Traits
Section: Chapter Questions
Problem 22QP: Height in humans is controlled by the additive action of genes and the action of environmental...
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6. In solving problems 1-4, you made some predictions of TRCs based on the genotypes
of the individuals involved. Suppose we could measure the TRCs for some people with
those genotypes and found the actual values to be different from those predicted by your
calculations. How would you explain these discrepancies?
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