Anatomy & Physiology: The Unity of Form and Function
Anatomy & Physiology: The Unity of Form and Function
8th Edition
ISBN: 9781259277726
Author: Kenneth S. Saladin Dr.
Publisher: McGraw-Hill Education
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Chapter 4, Problem 1TYR

Production of more than one phenotypic trait by a single gene is called

  1. a. pleiotrofy.
  2. b. genetic determinism.
  3. c. codominance.
  4. d. penetrance.
  5. e. genetic recombination
Expert Solution & Answer
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Summary Introduction

Introduction:

A single gene is responsible for the production of multiple phenotypes and this is termed as a pleiotropic effect. The gene influences multiple traits of organisms, which may transfer from one generation to another. In humans, phenylketonuria (PKU) is associated with pleiotropy. Phenylalanine hydroxylase converts phenylalanine to tyrosine; the mutation in phenylalanine hydroxylase encoding genes leads to multiple traits associated with phenylketonuria. It causes mental disorders, pigment defects, and eczema.

Answer to Problem 1TYR

Correct answer:

A single gene influences multiple or more than a phenotypic trait and is known as pleiotropy. Therefore, option a is correct.

Explanation of Solution

Justify reasons for the correct statement:

A single gene produces numerous phenotypic traits and is called as pleiotropy.

Option (a) is given as “pleiotropy”.

Multiple phenotypic characters produced by a gene is known as pleiotropy.

Hence, option (a) is correct.

Justify reasons for the incorrect statements:

Option (b) is given as “genetic determinism.

Controlling of race, sex, and mental health by genes is known as genetic determinism. Hence, it is a wrong answer.

Option (c) is given as “codominance”.

Expression of both alleles of a gene in an organism is known as codominance. Hence, it is a wrong answer.

Option (d) is given as “penetrance”.

Exhibition of expected phenotype from the percentage of the given genotype is known as penetrance. Hence, it is a wrong answer.

Option (e) is given as “genetic recombination”.

Exchange of genetic material between two chromosomes or a different location of a single chromosome is known as genetic recombination. Hence, it is a wrong answer.

Hence, options (b), (c), (d), and (e) are incorrect.

Conclusion

A single gene produces numerous phenotypic traits and is called as pleiotropy.

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Chapter 4 Solutions

Anatomy & Physiology: The Unity of Form and Function

Ch. 4.2 - Prob. 5BYGOCh. 4.2 - Describe the roles of RNA polymerase ribosomes,...Ch. 4.2 - What is the difference between genetic...Ch. 4.2 - Summarize the processing of a protein from the...Ch. 4.2 - Prob. 9BYGOCh. 4.2 - Prob. 10BYGOCh. 4.2 - Prob. 1AYLOCh. 4.2 - Prob. 2AYLOCh. 4.2 - The organization of nucleotides into DNA triplets;...Ch. 4.2 - How the genetic code relates mRNA codons to...Ch. 4.2 - The process and outcome of genetic transcription,...Ch. 4.2 - Prob. 6AYLOCh. 4.2 - Prob. 7AYLOCh. 4.2 - Prob. 8AYLOCh. 4.2 - Prob. 9AYLOCh. 4.2 - Prob. 10AYLOCh. 4.3 - Describe the genetic roles of DNA helicase and DNA...Ch. 4.3 - Explain why DNA replication is called...Ch. 4.3 - Define mutation. Explain why some mutations are...Ch. 4.3 - Prob. 14BYGOCh. 4.3 - Prob. 15BYGOCh. 4.3 - Prob. 16BYGOCh. 4.3 - Prob. 1AYLOCh. 4.3 - Semiconservative replication, the enzymes that...Ch. 4.3 - What a mutation is and how a cell detects and...Ch. 4.3 - The four stages of the cell cycle, what occurs in...Ch. 4.3 - Prob. 5AYLOCh. 4.3 - Cytokinesis and how it overlaps but differs from...Ch. 4.3 - Prob. 7AYLOCh. 4.3 - Prob. 8AYLOCh. 4.4 - Why must the carrier of a genetic disease be...Ch. 4.4 - Prob. 18BYGOCh. 4.4 - Prob. 19BYGOCh. 4.4 - Prob. 1AYLOCh. 4.4 - Organization of the karyotype; the number of...Ch. 4.4 - Prob. 3AYLOCh. 4.4 - Prob. 4AYLOCh. 4.4 - Prob. 5AYLOCh. 4.4 - Why a recessive trait can skip a generation, with...Ch. 4.4 - The differences between the genotype, genome, and...Ch. 4.4 - Prob. 8AYLOCh. 4.4 - Prob. 9AYLOCh. 4.4 - Prob. 10AYLOCh. 4.4 - Prob. 11AYLOCh. 4.4 - Prob. 12AYLOCh. 4.4 - Why it cannot be said that dominant alleles are...Ch. 4.4 - Prob. 14AYLOCh. 4 - Production of more than one phenotypic trait by a...Ch. 4 - When a ribosome reads a codon on mRNA, it must...Ch. 4 - Prob. 3TYRCh. 4 - Two genetically identical strands of a metaphase...Ch. 4 - Prob. 5TYRCh. 4 - Genetic transcription is performed by a....Ch. 4 - Prob. 7TYRCh. 4 - Prob. 8TYRCh. 4 - Semiconservative replication occurs during a....Ch. 4 - Mutagens sometimes cause no harm to cells for all...Ch. 4 - The cytoplasmic division at the end of mitosis is...Ch. 4 - Prob. 12TYRCh. 4 - Prob. 13TYRCh. 4 - Prob. 14TYRCh. 4 - Prob. 15TYRCh. 4 - Prob. 16TYRCh. 4 - Prob. 17TYRCh. 4 - The cytoplasmic granule of RNA and protein that...Ch. 4 - Prob. 19TYRCh. 4 - Prob. 20TYRCh. 4 - Prob. 1BYMVCh. 4 - Prob. 2BYMVCh. 4 - Prob. 3BYMVCh. 4 - Prob. 4BYMVCh. 4 - Prob. 5BYMVCh. 4 - Prob. 6BYMVCh. 4 - Prob. 7BYMVCh. 4 - Prob. 8BYMVCh. 4 - Prob. 9BYMVCh. 4 - Prob. 10BYMVCh. 4 - Prob. 1WWTSCh. 4 - Steroids, carbohydrates, and phospholipids are...Ch. 4 - Prob. 3WWTSCh. 4 - Prob. 4WWTSCh. 4 - Prob. 5WWTSCh. 4 - The law of complementary base pairing describes...Ch. 4 - Prob. 7WWTSCh. 4 - All mutations result m the production of defective...Ch. 4 - Prob. 9WWTSCh. 4 - Prob. 10WWTSCh. 4 - Why world the supercoiled, condensed form of...Ch. 4 - Prob. 2TYCCh. 4 - Given the information in this chapter, present an...Ch. 4 - Prob. 4TYCCh. 4 - Prob. 5TYC
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