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In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:
- a)Chromosomes failed to separate during meiosis
- b)The two genes are linked and present on the same chromosome
- c)Both of the characters are controlled by more than one gene
- d)The two genes are located on two different chromosomes
Correct answer is option 'B'. Can you explain this answer?
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In a test cross involving F1 dihybrid flies, more parental-type offspr...
When more parental-type offspring are produced than recombinant-type offspring in a test cross, it indicates that the two genes are linked and present on the same chromosome. This linkage reduces the frequency of recombination between them.
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In a test cross involving F1 dihybrid flies, more parental-type offspr...
Understanding Dihybrid Test Crosses
In a test cross involving F1 dihybrid flies, the observation that more parental-type offspring than recombinant-type offspring are produced indicates the following:
Genetic Linkage
- When two genes are located on the same chromosome, they tend to be inherited together, a phenomenon known as genetic linkage.
- In this scenario, the parental-type offspring arise from the combination of alleles that were present in the original parents.
Parental vs. Recombinant Types
- Parental-type offspring are those that exhibit the same phenotype as one of the parent organisms.
- Recombinant-type offspring result from crossing over during meiosis, leading to new combinations of traits.
- A higher number of parental-type offspring suggests that the genes are closely linked and less frequently separated by crossing over.
Implications of Linkage
- If the two genes were on different chromosomes, we would expect to see a 1:1:1:1 ratio of offspring types in a dihybrid cross due to independent assortment.
- The deviation from this ratio, with more parental types than recombinant types, strongly supports the conclusion that the genes are linked.
Conclusion
- Thus, the result of more parental-type offspring than recombinant types in the test cross indicates that the two genes are linked and located on the same chromosome (option B). This is a fundamental concept in genetics that helps understand the inheritance patterns of traits.
In a test cross involving F1 dihybrid flies, the observation that more parental-type offspring than recombinant-type offspring are produced indicates the following:
Genetic Linkage
- When two genes are located on the same chromosome, they tend to be inherited together, a phenomenon known as genetic linkage.
- In this scenario, the parental-type offspring arise from the combination of alleles that were present in the original parents.
Parental vs. Recombinant Types
- Parental-type offspring are those that exhibit the same phenotype as one of the parent organisms.
- Recombinant-type offspring result from crossing over during meiosis, leading to new combinations of traits.
- A higher number of parental-type offspring suggests that the genes are closely linked and less frequently separated by crossing over.
Implications of Linkage
- If the two genes were on different chromosomes, we would expect to see a 1:1:1:1 ratio of offspring types in a dihybrid cross due to independent assortment.
- The deviation from this ratio, with more parental types than recombinant types, strongly supports the conclusion that the genes are linked.
Conclusion
- Thus, the result of more parental-type offspring than recombinant types in the test cross indicates that the two genes are linked and located on the same chromosome (option B). This is a fundamental concept in genetics that helps understand the inheritance patterns of traits.
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In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:a)Chromosomes failed to separate during meiosisb)The two genes are linked and present on the same chromosomec)Both of the characters are controlled by more than one gened)The two genes are located on two different chromosomesCorrect answer is option 'B'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:a)Chromosomes failed to separate during meiosisb)The two genes are linked and present on the same chromosomec)Both of the characters are controlled by more than one gened)The two genes are located on two different chromosomesCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:a)Chromosomes failed to separate during meiosisb)The two genes are linked and present on the same chromosomec)Both of the characters are controlled by more than one gened)The two genes are located on two different chromosomesCorrect answer is option 'B'. Can you explain this answer?.
In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:a)Chromosomes failed to separate during meiosisb)The two genes are linked and present on the same chromosomec)Both of the characters are controlled by more than one gened)The two genes are located on two different chromosomesCorrect answer is option 'B'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:a)Chromosomes failed to separate during meiosisb)The two genes are linked and present on the same chromosomec)Both of the characters are controlled by more than one gened)The two genes are located on two different chromosomesCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:a)Chromosomes failed to separate during meiosisb)The two genes are linked and present on the same chromosomec)Both of the characters are controlled by more than one gened)The two genes are located on two different chromosomesCorrect answer is option 'B'. Can you explain this answer?.
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In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:a)Chromosomes failed to separate during meiosisb)The two genes are linked and present on the same chromosomec)Both of the characters are controlled by more than one gened)The two genes are located on two different chromosomesCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:a)Chromosomes failed to separate during meiosisb)The two genes are linked and present on the same chromosomec)Both of the characters are controlled by more than one gened)The two genes are located on two different chromosomesCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates:a)Chromosomes failed to separate during meiosisb)The two genes are linked and present on the same chromosomec)Both of the characters are controlled by more than one gened)The two genes are located on two different chromosomesCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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