Domanda del libro di testo
________ are segments of DNA that code for a specific protein, and the human ________ includes over 20,000 of these segments.
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Ch. 27 Development and Heredity
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822
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TOC.tableOfContents
- Ch. 1 Introduction to Anatomy and Physiology26
- Ch. 2 The Chemistry of Life38
- Ch. 3 The Cell55
- Ch. 4 Histology47
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System36
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System42
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart30
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity45
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Non è quello che usi tu?Cambia libro di testo
Capitolo 27, Problema 20
Which pattern of inheritance includes examples of codominance?
a. Autosomal dominant and recessive traits
b. Multiple-allele traits
c. Sex-linked traits
d. Polygenic inheritance
Guida verificata passo dopo passo1
Understand the concept of codominance: Codominance occurs when two alleles for a gene are expressed equally in the phenotype of an organism. This means that neither allele is dominant or recessive, and both traits are visible simultaneously.
Review the inheritance patterns provided in the options: Autosomal dominant and recessive traits involve one allele being dominant over the other, so codominance does not apply here. Sex-linked traits are associated with genes located on sex chromosomes, and codominance is not typically a feature of this pattern. Polygenic inheritance involves multiple genes contributing to a single trait, which is different from codominance.
Focus on the 'multiple-allele traits' option: Multiple-allele traits involve more than two alleles for a single gene. Codominance can occur in this pattern when two alleles are expressed equally in the phenotype. A classic example is the ABO blood group system, where both A and B alleles are codominant.
Relate codominance to real-world examples: In the ABO blood group system, individuals with genotype 'IAIB' express both A and B antigens on their red blood cells, demonstrating codominance.
Conclude that the correct answer is the inheritance pattern that includes examples of codominance, which is 'multiple-allele traits.'
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Codominance
Codominance is a genetic scenario where two different alleles for a gene are both expressed equally in the phenotype of an organism. This results in a phenotype that displays characteristics of both alleles simultaneously, such as in the case of AB blood type in humans, where both A and B alleles are fully expressed.
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02:59
Codominance
Multiple-allele traits
Multiple-allele traits refer to situations where a gene has more than two alleles in the population. This allows for a variety of phenotypes to emerge, as seen in the ABO blood group system, where three alleles (IA, IB, and i) determine the blood type, including codominance between IA and IB.
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03:39Dominant vs. Recessive Alleles
Patterns of inheritance
Patterns of inheritance describe how traits are passed from parents to offspring through genetic mechanisms. Understanding these patterns, such as autosomal dominant, autosomal recessive, and codominance, is crucial for predicting phenotypic outcomes in offspring based on parental genotypes.
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01:02Autosomal Inheritance
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Domanda del libro di testo
Elise is a freshman college student taking Introduction to Biology. In lab, she is asked her parents' blood types to complete a Punnett square. She knows that she has type A blood and that her mother has type B, but she does not know her father's blood type. Elise's lab partner assures her that she can figure out her father's blood type just by knowing her own and her mother's. Is her lab partner correct? Explain why or why not.
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Domanda del libro di testo
Determine the probability of a couple having a child with a widow's peak if the conditions are as follows: The gene for widow's peak follows strict autosomal dominant-recessive inheritance. Widow's peak (W) is dominant, and no widow's peak (w) is recessive. The genotype of the mother is Ww, and the genotype of the father is ww.
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