Domanda del libro di testo
Two pea plants heterozygous for the characters of pod color and pod shape are crossed. Draw a Punnett square to determine the phenotypic ratios of the offspring.
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Ch. 14 - Mendel and the Gene Idea
Urry12th EditionCampbell BiologyISBN: 9785794169850
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TOC.tableOfContents
- Ch. 1 - Evolution, the Themes of Biology, and Scientific Inquiry8
- Ch. 2 - The Chemical Context of Life8
- Ch. 3 - Water and Life6
- Ch. 4 - Carbon and the Molecular Diversity of Life9
- Ch. 5 - The Structure and Function of Large Biological Molecules9
- Ch. 6 - A Tour of the Cell6
- Ch. 7 - Membrane Structure and Function6
- Ch. 8 - An Introduction to Metabolism6
- Ch. 9 - Cellular Respiration and Fermentation10
- Ch. 10 - Photosynthesis7
- Ch. 11 - Cell Communication7
- Ch. 12 - The Cell Cycle11
- Ch. 13 - Meiosis and Sexual Life Cycles10
- Ch. 14 - Mendel and the Gene Idea14
- Ch, 15 - The Chromosomal Basis of Inheritance6
- Ch. 16 - The Molecular Basis of Inheritance9
- Ch. 17 - Gene Expression: From Gene to Protein9
- Ch. 18 - Regulation of Gene Expression10
- Ch. 19 - Viruses6
- Ch. 20 - DNA Tools and Biotechnology7
- Ch. 21 - Genomes and Their Evolution8
- Ch. 22 - Descent with Modification: A Darwininan View of Life6
- Ch. 23 - The Evolution of Populations5
- Ch. 24 - The Origin of Species6
- Ch. 25 - The History of Life on Earth8
- Ch. 26 - Phylogeny and the Tree of Life8
- Ch. 27 - Bacteria and Archaea6
- Ch. 28 - Protists7
- Ch. 29 - Plant Diversity I: How Plants Colonized Land7
- Ch. 30 - Plant Diversity II: The Evolution of Seed Plants6
- Ch. 31 - Fungi5
- Ch. 32 - An Overview of Animal Diversity4
- Ch. 33 - An introduction to Invertebrates6
- Ch. 34 - The Origin and Evolution of Vertebrates7
- Ch. 35 - Vascular Plant Structure, Growth, and Development10
- Ch. 36 - Resource Acquisition and Transport in Vascular Plants8
- Ch. 37 - Soil and Plant Nutrition11
- Ch. 38 - Angiosperm Reproduction and Biotechnology8
- Ch. 39 - Plant Responses to Internal and External Signals8
- Ch. 40 - Basic Principles of Animal Form and Function8
- Ch. 41 - Animal Nutrition7
- Ch. 42 - Circulation and Gas Exchange7
- Ch. 43 - The Immune System5
- Ch. 44 - Osmoregulation and Excretion6
- Ch. 45 - Hormones and the Endocrine System8
- Ch. 46 - Animal Reproduction9
- Ch. 47 - Animal Development8
- Ch. 48 - Neurons, Synapses, and Signaling6
- Ch. 49 - Nervous Systems8
- Ch. 50 - Sensory and Motor Mechanisms5
- Ch. 51 Animal Behavior6
- Ch. 52 - An Introduction to Ecology and the Biosphere7
- Ch. 53 - Population Ecology9
- Ch. 54 - Community Ecology9
- Ch. 55 - Ecosystems and Restoration Ecology8
- Ch. 56 - Conservation Biology and Global Change6
Capitolo 14, Problema 1
A pea plant heterozygous for inflated pods (Ii) is crossed with a plant homozygous for constricted pods (ii). Draw a Punnett square for this cross to predict genotypic and phenotypic ratios. Assume that pollen comes from the ii plant.
Guida verificata passo dopo passo1
Step 1: Understand the genetic makeup of the parents. The heterozygous pea plant has the genotype Ii, meaning it has one dominant allele (I) for inflated pods and one recessive allele (i) for constricted pods. The homozygous pea plant has the genotype ii, meaning it has two recessive alleles for constricted pods.
Step 2: Set up the Punnett square. A Punnett square is a grid used to predict the genotypes of offspring. Write the alleles of the heterozygous parent (Ii) along the top of the square, and the alleles of the homozygous parent (ii) along the side of the square. This will create a 2x2 grid.
Step 3: Fill in the Punnett square. Combine the alleles from the top and side of the grid to determine the possible genotypes of the offspring. For example, the top row of the grid will combine the I allele from the heterozygous parent with the i allele from the homozygous parent, and the bottom row will combine the i allele from the heterozygous parent with the i allele from the homozygous parent.
Step 4: Analyze the genotypic ratios. Count the number of each genotype in the Punnett square. For this cross, you will have two Ii offspring (heterozygous for inflated pods) and two ii offspring (homozygous for constricted pods). The genotypic ratio is therefore 2 Ii : 2 ii.
Step 5: Determine the phenotypic ratios. Since the dominant allele (I) results in inflated pods, the heterozygous offspring (Ii) will have inflated pods, while the homozygous recessive offspring (ii) will have constricted pods. The phenotypic ratio is therefore 2 inflated pods : 2 constricted pods.
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Punnett Square
A Punnett square is a diagram used to predict the genotypic and phenotypic outcomes of a genetic cross. It organizes the possible combinations of alleles from each parent, allowing for a visual representation of inheritance patterns. In this case, it will help determine the ratios of offspring genotypes and phenotypes resulting from the cross between a heterozygous and a homozygous plant.
Video consigliato:
01:37
Punnett Squares
Genotype and Phenotype
Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular trait. Phenotype, on the other hand, is the observable expression of that genotype, influenced by both genetic and environmental factors. Understanding the difference is crucial for interpreting the results of the Punnett square in terms of both genetic ratios and physical traits.
Video consigliato:
06:36Genotype & Phenotype
Mendelian Inheritance
Mendelian inheritance is the set of principles that describe how traits are passed from parents to offspring through alleles. It includes concepts such as dominance, where one allele can mask the expression of another, and segregation, which states that allele pairs separate during gamete formation. This framework is essential for predicting the outcomes of genetic crosses, such as the one described in the question.
Video consigliato:
02:27Polygenic Inheritance
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