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Flower color may be red, white, or pink, and flower shape may be personate or peloric. For the following crosses, determine the P₁ and F₁ genotypes:
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Ch. 4 - Modification of Mendelian Ratios
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics16
- Ch. 2 - Mitosis and Meiosis28
- Ch. 3 - Mendelian Genetics37
- Ch. 4 - Modification of Mendelian Ratios53
- Ch. 5 - Sex Determination and Sex Chromosomes32
- Ch. 6 - Chromosome Mutations: Variation in Number and Arrangement37
- Ch. 7 - Linkage and Chromosome Mapping in Eukaryotes36
- Ch. 8 - Genetic Analysis and Mapping in Bacteria and Bacteriophages24
- Ch. 9 - DNA Structure and Analysis38
- Ch. 10 - DNA Replication29
- Ch. 11 - Chromosome Structure and DNA Sequence Organization22
- Ch. 12 - The Genetic Code and Transcription36
- Ch. 13 - Translation and Proteins27
- Ch. 14 - Gene Mutation, DNA Repair, and Transposition34
- Ch. 15 - Regulation of Gene Expression in Bacteria22
- Ch. 16 - Regulation of Gene Expression in Eukaryotes37
- Ch. 17 - Recombinant DNA Technology27
- Ch. 18 - Genomics, Bioinformatics, and Proteomics30
- Ch. 19 - The Genetics of Cancer21
- Ch. 20 - Quantitative Genetics and Multifactorial Traits37
- Ch. 21 - Population and Evolutionary Genetics45
Klug10th EditionEssentials of GeneticsISBN: 9780135588789Non è quello che usi tu?Cambia libro di testo
Capitolo 4, Problema 4
With regard to the ABO blood types in humans, determine the genotype of the male parent and female parent shown here:
Male parent: Blood type B; mother type O
Female parent: Blood type A; father type B
Predict the blood types of the offspring that this couple may have and the expected proportion of each.
Guida verificata passo dopo passo1
Step 1: Determine the possible genotypes of the male parent. Since the male has blood type B and his mother has blood type O, the male must have inherited an O allele from his mother. Therefore, the male's genotype is heterozygous B\/O (\( I^B I^O \)).
Step 2: Determine the possible genotypes of the female parent. The female has blood type A and her father has blood type B. Since the father is type B, he could have passed either a B or an O allele. The female's genotype could be either A\/A (\( I^A I^A \)) or A\/O (\( I^A I^O \)). Both are possible, so consider both cases for offspring prediction.
Step 3: Set up Punnett squares for each possible female genotype crossed with the male genotype B\/O (\( I^B I^O \)). For the female genotype A\/A (\( I^A I^A \)), cross \( I^A I^A \) with \( I^B I^O \). For the female genotype A\/O (\( I^A I^O \)), cross \( I^A I^O \) with \( I^B I^O \).
Step 4: From each Punnett square, list all possible genotypes of the offspring and determine their corresponding blood types: A (\( I^A I^A \) or \( I^A I^O \)), B (\( I^B I^B \) or \( I^B I^O \)), AB (\( I^A I^B \)), and O (\( I^O I^O \)).
Step 5: Calculate the expected proportion of each blood type among the offspring by counting the frequency of each genotype in the Punnett square and converting it to a percentage or fraction.
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ABO Blood Group System
The ABO blood group system classifies human blood into four types (A, B, AB, O) based on the presence or absence of antigens on red blood cells. The A and B alleles are codominant, while O is recessive. Understanding this system is essential to determine possible genotypes and phenotypes in offspring.
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Percorso guidato
04:37
Variations on Dominance
Genotype Determination from Phenotype and Parental Information
Phenotypes (observable traits) like blood type can correspond to multiple genotypes. Using information about the parents’ blood types and their parents’ blood types helps infer the parents’ genotypes by considering dominant and recessive allele inheritance patterns.
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Percorso guidato
07:11Mapping with Markers
Punnett Square and Probability of Offspring Genotypes
A Punnett square is a tool used to predict the genotypes and phenotypes of offspring from parental genotypes. It helps calculate the expected proportions of each blood type in the children by combining alleles from each parent according to Mendelian inheritance.
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18:27Chi Square Analysis
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Domanda del libro di testo
In shorthorn cattle, coat color may be red, white, or roan. Roan is an intermediate phenotype expressed as a mixture of red and white hairs. The following data were obtained from various crosses:
How is coat color inherited? What are the genotypes of parents and offspring for each cross?
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Domanda del libro di testo
In foxes, two alleles of a single gene, P and p, may result in lethality (PP), platinum coat (Pp), or silver coat (pp). What ratio is obtained when platinum foxes are interbred? Is the P allele behaving dominantly or recessively in causing (a) lethality; (b) platinum coat color?
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Domanda del libro di testo
Three gene pairs located on separate autosomes determine flower color and shape as well as plant height. The first pair exhibits incomplete dominance, where the color can be red, pink (the heterozygote), or white. The second pair leads to personate (dominant) or peloric (recessive) flower shape, while the third gene pair produces either the dominant tall trait or the recessive dwarf trait. Homozygous plants that are red, personate, and tall are crossed to those that are white, peloric, and dwarf. Determine the F₁ genotype(s) and phenotype(s). If the F₁ plants are interbred, what proportion of the offspring will exhibit the same phenotype as the F₁ plants?
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