Ch. 29 Heredity
Hoehn, Haynes, Abbott12th EditionMarieb Human Anatomy & PhysiologyISBN: 9780138242732
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TOC.tableOfContents
- Ch. 1 The Human Body: An Orientation25
- Ch. 2 Chemistry Comes Alive24
- Ch. 3 Cells: The Living Units24
- Ch. 4 Tissue: The Living Fabric19
- Ch. 5 The Integumentary System12
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton14
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System25
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue23
- Ch. 12 The Central Nervous System25
- Ch. 13 The Peripheral Nervous System and Reflex Activity30
- Ch. 14 The Autonomic Nervous System16
- Ch. 15 The Special Senses26
- Ch. 16 The Endocrine System26
- Ch. 17 Blood27
- Ch. 18 The Cardiovascular System: The Heart25
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues16
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses27
- Ch. 22 The Respiratory System21
- Ch. 23 The Digestive System31
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System26
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System24
- Ch. 28 Pregnancy and Human Development25
- Ch. 29 Heredity11
Hoehn, Haynes, Abbott12th EditionMarieb Human Anatomy & PhysiologyISBN: 9780138242732Non è quello che usi tu?Cambia libro di testo
Capitolo 29, Problema 2
Match the following types of inheritance (key terms a–f) with
the descriptions below:
Key:
(a) dominant-recessive
(b) incomplete dominance
(c) multiple-allele
(d) polygene
(e) sex-linked
(f) extranuclear
____ (1) only sons show the trait
____ (2) homozygotes and heterozygotes have the same phenotype
____ (3) heterozygotes exhibit a phenotype intermediate between those of the homozygotes
____ (4) phenotypes of offspring may be more varied than
those of the parents
____ (5) inheritance of ABO blood types
____ (6) inheritance of stature
____ (7) reflects activity of mitochondrial DNA
Guida verificata passo dopo passo1
Step 1: Understand that sex-linked inheritance (e) typically affects only one sex, often males, because the gene is located on a sex chromosome (usually the X chromosome). Therefore, the description 'only sons show the trait' corresponds to (e) sex-linked.
Step 2: Recognize that in dominant-recessive inheritance (a), heterozygotes and homozygous dominants have the same phenotype because the dominant allele masks the recessive one. Thus, 'homozygotes and heterozygotes have the same phenotype' matches (a) dominant-recessive.
Step 3: In incomplete dominance (b), heterozygotes show an intermediate phenotype between the two homozygotes. So, 'heterozygotes exhibit a phenotype intermediate between those of the homozygotes' corresponds to (b) incomplete dominance.
Step 4: Multiple-allele inheritance (c) involves more than two alleles for a gene, leading to greater phenotypic variety among offspring than parents. Hence, 'phenotypes of offspring may be more varied than those of the parents' matches (c) multiple-allele.
Step 5: The inheritance of ABO blood types is a classic example of multiple alleles (A, B, and O), so 'inheritance of ABO blood types' also corresponds to (c) multiple-allele. For 'inheritance of stature,' which is influenced by many genes, this matches (d) polygene. Finally, 'reflects activity of mitochondrial DNA' refers to (f) extranuclear inheritance.
Concetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Sex-linked Inheritance
Sex-linked inheritance refers to genes located on sex chromosomes, often the X chromosome. Traits following this pattern typically appear more frequently in males, as they have only one X chromosome, so recessive alleles are expressed. An example is hemophilia, where only sons may show the trait if inherited from carrier mothers.
Video consigliato:
Percorso guidato
04:17
Sex-Linked Inheritance
Incomplete Dominance
Incomplete dominance occurs when heterozygotes display a phenotype that is intermediate between the two homozygous forms. Unlike dominant-recessive inheritance, neither allele is completely dominant, resulting in blended traits, such as pink flowers from red and white parents.
Video consigliato:
Percorso guidato
03:09Incomplete Dominance
Multiple-Allele Inheritance
Multiple-allele inheritance involves more than two allele forms for a single gene within a population. This increases phenotypic variety, as seen in the ABO blood group system, where three alleles (A, B, O) combine to produce different blood types.
Video consigliato:
Percorso guidato
07:23X-Linked Inheritance
Pratica correlata