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Consider two hypothetical recessive autosomal genes a and b where a heterozygote is testcrossed to a double homozygous mutant . Predict the phenotypic ratios under the following conditions. A) a and b are located on separate autosomes B) a and b are linked on the same autosome but are so far apart that a cross over occurs between them C) a and b are linked on the same autosome but are so close together that a cross over almost never occurs?
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Consider two hypothetical recessive autosomal genes a and b where a he...
Phenotypic ratios of offspring in different scenarios of gene linkage
A) a and b are located on separate autosomes:
When the genes a and b are located on separate autosomes, they segregate independently during meiosis. This means that the phenotypic ratios of the offspring will follow Mendel's law of independent assortment, which predicts a 1:1:1:1 phenotypic ratio.
For example, if the heterozygote parent is AaBb and it is testcrossed with a double homozygous mutant aabb, the possible genotypes of the offspring will be: AaBb, Aabb, aaBb, aabb. The phenotypic ratio will be 1:1:1:1, meaning that each phenotype is equally likely to occur.
B) a and b are linked on the same autosome but crossover occurs:
When a and b are located on the same autosome but are far apart, there is a possibility of a crossover event happening between them during meiosis. Crossover is the exchange of genetic material between homologous chromosomes, and it can result in recombination of alleles.
In this scenario, the phenotypic ratios will still be influenced by the law of independent assortment, but the ratios may deviate from the 1:1:1:1 ratio observed in the previous scenario. The occurrence of crossovers leads to recombination of alleles and can result in different phenotypic combinations.
The closer the genes a and b are to each other, the lower the frequency of crossovers between them. As a result, the phenotypic ratios will be closer to the 1:1:1:1 ratio. However, if the genes are very far apart, the chances of a crossover event occurring between them increase, and the phenotypic ratios may deviate further from the 1:1:1:1 ratio.
C) a and b are linked on the same autosome and crossover almost never occurs:
When a and b are located very close to each other on the same autosome, the chances of a crossover event occurring between them are extremely low. In this scenario, the genes are said to be tightly linked.
Tightly linked genes will be inherited together more often, resulting in a deviation from the phenotypic ratios predicted by Mendel's law of independent assortment. The phenotypic ratios will be biased towards the parental phenotypes.
For example, if the heterozygote parent is AaBb and it is testcrossed with a double homozygous mutant aabb, the possible genotypes of the offspring will be: AaBb (parental), Aabb (parental), aaBb (recombinant), aabb (parental). The phenotypic ratio will be biased towards the parental phenotypes, with more offspring exhibiting the parental phenotypes compared to the recombinant phenotype.
In summary, the phenotypic ratios of offspring will vary depending on the scenario of gene linkage. When the genes are located on separate autosomes, the ratios will follow Mendel's law of independent assortment. When crossovers occur between the genes, the ratios may deviate from the expected 1:1:1:1 ratio. When the genes are tightly linked and crossovers almost never occur, the phenotypic
A) a and b are located on separate autosomes:
When the genes a and b are located on separate autosomes, they segregate independently during meiosis. This means that the phenotypic ratios of the offspring will follow Mendel's law of independent assortment, which predicts a 1:1:1:1 phenotypic ratio.
For example, if the heterozygote parent is AaBb and it is testcrossed with a double homozygous mutant aabb, the possible genotypes of the offspring will be: AaBb, Aabb, aaBb, aabb. The phenotypic ratio will be 1:1:1:1, meaning that each phenotype is equally likely to occur.
B) a and b are linked on the same autosome but crossover occurs:
When a and b are located on the same autosome but are far apart, there is a possibility of a crossover event happening between them during meiosis. Crossover is the exchange of genetic material between homologous chromosomes, and it can result in recombination of alleles.
In this scenario, the phenotypic ratios will still be influenced by the law of independent assortment, but the ratios may deviate from the 1:1:1:1 ratio observed in the previous scenario. The occurrence of crossovers leads to recombination of alleles and can result in different phenotypic combinations.
The closer the genes a and b are to each other, the lower the frequency of crossovers between them. As a result, the phenotypic ratios will be closer to the 1:1:1:1 ratio. However, if the genes are very far apart, the chances of a crossover event occurring between them increase, and the phenotypic ratios may deviate further from the 1:1:1:1 ratio.
C) a and b are linked on the same autosome and crossover almost never occurs:
When a and b are located very close to each other on the same autosome, the chances of a crossover event occurring between them are extremely low. In this scenario, the genes are said to be tightly linked.
Tightly linked genes will be inherited together more often, resulting in a deviation from the phenotypic ratios predicted by Mendel's law of independent assortment. The phenotypic ratios will be biased towards the parental phenotypes.
For example, if the heterozygote parent is AaBb and it is testcrossed with a double homozygous mutant aabb, the possible genotypes of the offspring will be: AaBb (parental), Aabb (parental), aaBb (recombinant), aabb (parental). The phenotypic ratio will be biased towards the parental phenotypes, with more offspring exhibiting the parental phenotypes compared to the recombinant phenotype.
In summary, the phenotypic ratios of offspring will vary depending on the scenario of gene linkage. When the genes are located on separate autosomes, the ratios will follow Mendel's law of independent assortment. When crossovers occur between the genes, the ratios may deviate from the expected 1:1:1:1 ratio. When the genes are tightly linked and crossovers almost never occur, the phenotypic
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Consider two hypothetical recessive autosomal genes a and b where a heterozygote is testcrossed to a double homozygous mutant . Predict the phenotypic ratios under the following conditions. A) a and b are located on separate autosomes B) a and b are linked on the same autosome but are so far apart that a cross over occurs between them C) a and b are linked on the same autosome but are so close together that a cross over almost never occurs?
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Consider two hypothetical recessive autosomal genes a and b where a heterozygote is testcrossed to a double homozygous mutant . Predict the phenotypic ratios under the following conditions. A) a and b are located on separate autosomes B) a and b are linked on the same autosome but are so far apart that a cross over occurs between them C) a and b are linked on the same autosome but are so close together that a cross over almost never occurs? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Consider two hypothetical recessive autosomal genes a and b where a heterozygote is testcrossed to a double homozygous mutant . Predict the phenotypic ratios under the following conditions. A) a and b are located on separate autosomes B) a and b are linked on the same autosome but are so far apart that a cross over occurs between them C) a and b are linked on the same autosome but are so close together that a cross over almost never occurs? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider two hypothetical recessive autosomal genes a and b where a heterozygote is testcrossed to a double homozygous mutant . Predict the phenotypic ratios under the following conditions. A) a and b are located on separate autosomes B) a and b are linked on the same autosome but are so far apart that a cross over occurs between them C) a and b are linked on the same autosome but are so close together that a cross over almost never occurs?.
Consider two hypothetical recessive autosomal genes a and b where a heterozygote is testcrossed to a double homozygous mutant . Predict the phenotypic ratios under the following conditions. A) a and b are located on separate autosomes B) a and b are linked on the same autosome but are so far apart that a cross over occurs between them C) a and b are linked on the same autosome but are so close together that a cross over almost never occurs? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Consider two hypothetical recessive autosomal genes a and b where a heterozygote is testcrossed to a double homozygous mutant . Predict the phenotypic ratios under the following conditions. A) a and b are located on separate autosomes B) a and b are linked on the same autosome but are so far apart that a cross over occurs between them C) a and b are linked on the same autosome but are so close together that a cross over almost never occurs? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider two hypothetical recessive autosomal genes a and b where a heterozygote is testcrossed to a double homozygous mutant . Predict the phenotypic ratios under the following conditions. A) a and b are located on separate autosomes B) a and b are linked on the same autosome but are so far apart that a cross over occurs between them C) a and b are linked on the same autosome but are so close together that a cross over almost never occurs?.
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Consider two hypothetical recessive autosomal genes a and b where a heterozygote is testcrossed to a double homozygous mutant . Predict the phenotypic ratios under the following conditions. A) a and b are located on separate autosomes B) a and b are linked on the same autosome but are so far apart that a cross over occurs between them C) a and b are linked on the same autosome but are so close together that a cross over almost never occurs?, a detailed solution for Consider two hypothetical recessive autosomal genes a and b where a heterozygote is testcrossed to a double homozygous mutant . Predict the phenotypic ratios under the following conditions. A) a and b are located on separate autosomes B) a and b are linked on the same autosome but are so far apart that a cross over occurs between them C) a and b are linked on the same autosome but are so close together that a cross over almost never occurs? has been provided alongside types of Consider two hypothetical recessive autosomal genes a and b where a heterozygote is testcrossed to a double homozygous mutant . Predict the phenotypic ratios under the following conditions. A) a and b are located on separate autosomes B) a and b are linked on the same autosome but are so far apart that a cross over occurs between them C) a and b are linked on the same autosome but are so close together that a cross over almost never occurs? theory, EduRev gives you an
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