Domanda del libro di testo
Which of Mendel's postulates can only be demonstrated in crosses involving at least two pairs of traits? State the postulate.
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Ch. 3 - Mendelian Genetics
Klug12th EditionConcepts of GeneticsISBN: 9780135564776
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics17
- Ch. 2 - Mitosis and Meiosis36
- Ch. 3 - Mendelian Genetics51
- Ch. 4 - Extensions of Mendelian Genetics74
- Ch. 5 - Chromosome Mapping in Eukaryotes51
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages46
- Ch. 7 - Sex Determination and Sex Chromosomes33
- Ch. 8 - Chromosome Mutations: Variation in Number and Arrangement40
- Ch. 9 - Extranuclear Inheritance31
- Ch. 10 - DNA Structure and Analysis43
- Ch. 11 - DNA Replication and Recombination44
- Ch. 12 - DNA Organization in Chromosomes30
- Ch. 13 - The Genetic Code and Transcription54
- Ch. 14 - Translation and Proteins47
- Ch. 15 - Gene Mutation, DNA Repair, and Transposition41
- Ch. 16 - Regulation of Gene Expression in Bacteria29
- Ch. 17 - Transcriptional Regulation in Eukaryotes41
- Ch. 18 - Post-transcriptional Regulation in Eukaryotes33
- Ch. 19 - Epigenetics33
- Ch. 20 - Recombinant DNA Technology44
- Ch. 21 - Genomic Analysis36
- Ch. 22 - Applications of Genetic Engineering and Biotechnology36
- Ch. 23 - Developmental Genetics37
- Ch. 24 - Cancer Genetics34
- Ch. 25 - Quantitative Genetics and Multifactorial Traits54
- Ch. 26 - Population and Evolutionary Genetics45
Klug12th EditionConcepts of GeneticsISBN: 9780135564776Non è quello che usi tu?Cambia libro di testo
Capitolo 3, Problema 10b
In a cross between a black and a white guinea pig, all members of the F₁ generation are black. The F₂ generation is made up of approximately 3/4 black and 1/4 white guinea pigs. What will the offspring be like if two F₂ white guinea pigs are mated?
Guida verificata passo dopo passo1
Determine the inheritance pattern: The problem suggests a Mendelian inheritance pattern with black (B) being dominant and white (b) being recessive. This means black guinea pigs can have genotypes BB or Bb, while white guinea pigs must have the genotype bb.
Analyze the F₂ generation: The 3:1 ratio in the F₂ generation indicates a monohybrid cross (Bb x Bb), where the genotypes are distributed as 1 BB : 2 Bb : 1 bb. Only the bb individuals are white.
Identify the genotypes of the parents for this specific cross: Since the question asks about mating two F₂ white guinea pigs, both parents must have the genotype bb.
Set up the Punnett square for the bb x bb cross: Each parent can only contribute the recessive allele (b) to their offspring. Fill in the Punnett square to determine the genotypes of the offspring.
Interpret the results: Since both parents are bb, all offspring will inherit one b allele from each parent, resulting in 100% bb offspring. This means all the offspring will be white guinea pigs.
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Mendelian Inheritance
Mendelian inheritance refers to the principles of heredity established by Gregor Mendel, which include the concepts of dominant and recessive traits. In this case, black fur is dominant over white fur, meaning that when a black and a white guinea pig are crossed, the offspring (F₁ generation) will exhibit the dominant trait, resulting in all black guinea pigs.
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05:13
Organelle Inheritance
Genotype and Phenotype
The genotype is the genetic makeup of an organism, while the phenotype is the observable physical characteristics. In the F₂ generation, the phenotypic ratio of 3:1 (black to white) suggests that the black guinea pigs can be either homozygous (BB) or heterozygous (Bb), while the white guinea pigs must be homozygous recessive (bb).
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Percorso guidato
07:52Gamete Genotypes
Punnett Square
A Punnett square is a diagram used to predict the genetic outcomes of a cross between two organisms. When two F₂ white guinea pigs (bb) are mated, the Punnett square will show that all offspring will also be white (bb), as there are no dominant alleles present to express the black phenotype.
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18:27Chi Square Analysis
Pratica correlata
Domanda del libro di testo
In Drosophila, gray body color is dominant to ebony body color, while long wings are dominant to vestigial wings. Assuming that the P₁ individuals are homozygous, work the following crosses through the F₂ generation, and determine the genotypic and phenotypic ratios for each generation.
gray, long x ebony, vestigial
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Domanda del libro di testo
What is the basis for homology among chromosomes?
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Domanda del libro di testo
Based on the preceding cross, what is the probability that an organism in the F₂ generation will have round seeds and green cotyledons and be true breeding?
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Domanda del libro di testo
In a cross between a black and a white guinea pig, all members of the F₁ generation are black. The F₂ generation is made up of approximately 3/4 black and 1/4 white guinea pigs. Two different matings were made between black members of the F₂ generation, with the following results. Diagram each of the crosses.
Cross Offspring
Cross 1 All black
Cross 2 3/4 black, 1/4 white
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Domanda del libro di testo
In a cross between a black and a white guinea pig, all members of the F₁ generation are black. The F₂ generation is made up of approximately 3/4 black and 1/4 white guinea pigs. Diagram this cross, showing the genotypes and phenotypes.
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