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Which of the following is correct for the condition when plant YyRr is test cross with double recessive parent A. 9:3:3:1 ratio of phenotypes B. 9:3:3:1 ratio of genotypes only C. 1:1:1:1 ratio of phenotypes only D. 1:1:1:1 ratio of phenotypes and genotypes?
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Which of the following is correct for the condition when plant YyRr is...
Answer:
A. 9:3:3:1 ratio of phenotypes
Explanation:
- Test cross is a cross between an individual showing a dominant phenotype but with unknown genotype with a homozygous recessive individual.
- In the given scenario, plant YyRr is test crossed with double recessive parent A (aa rr).
- The possible gametes of YyRr are YR, Yr, yR, and yr.
- The gametes of aa rr parent are ar and ar.
- The possible genotypes of the offspring are YyRr, Yyrr, yyRr, and yyrr.
- The phenotype of YyRr is dominant for both traits (yellow and round), and the phenotype of aa rr is recessive for both traits (green and wrinkled).
- The expected phenotypic ratio of the offspring is 9:3:3:1, which means 9 plants with dominant phenotype for both traits, 3 plants with dominant phenotype for one trait and recessive for the other trait, 3 plants with recessive phenotype for one trait and dominant for the other trait, and 1 plant with recessive phenotype for both traits.
- The expected genotypic ratio of the offspring is 1:2:1:2:4:2:1:2:1, which means 1 YyRr, 2 Yyrr, 1 yyRr, 2 yyrr, 4 aarr, 2 aaRr, 1 Aarr, 2 AaRr, and 1 AArr.
- Therefore, the correct answer is A. 9:3:3:1 ratio of phenotypes.
A. 9:3:3:1 ratio of phenotypes
Explanation:
- Test cross is a cross between an individual showing a dominant phenotype but with unknown genotype with a homozygous recessive individual.
- In the given scenario, plant YyRr is test crossed with double recessive parent A (aa rr).
- The possible gametes of YyRr are YR, Yr, yR, and yr.
- The gametes of aa rr parent are ar and ar.
- The possible genotypes of the offspring are YyRr, Yyrr, yyRr, and yyrr.
- The phenotype of YyRr is dominant for both traits (yellow and round), and the phenotype of aa rr is recessive for both traits (green and wrinkled).
- The expected phenotypic ratio of the offspring is 9:3:3:1, which means 9 plants with dominant phenotype for both traits, 3 plants with dominant phenotype for one trait and recessive for the other trait, 3 plants with recessive phenotype for one trait and dominant for the other trait, and 1 plant with recessive phenotype for both traits.
- The expected genotypic ratio of the offspring is 1:2:1:2:4:2:1:2:1, which means 1 YyRr, 2 Yyrr, 1 yyRr, 2 yyrr, 4 aarr, 2 aaRr, 1 Aarr, 2 AaRr, and 1 AArr.
- Therefore, the correct answer is A. 9:3:3:1 ratio of phenotypes.
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Which of the following is correct for the condition when plant YyRr is...
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Which of the following is correct for the condition when plant YyRr is test cross with double recessive parent A. 9:3:3:1 ratio of phenotypes B. 9:3:3:1 ratio of genotypes only C. 1:1:1:1 ratio of phenotypes only D. 1:1:1:1 ratio of phenotypes and genotypes?
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Which of the following is correct for the condition when plant YyRr is test cross with double recessive parent A. 9:3:3:1 ratio of phenotypes B. 9:3:3:1 ratio of genotypes only C. 1:1:1:1 ratio of phenotypes only D. 1:1:1:1 ratio of phenotypes and genotypes? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Which of the following is correct for the condition when plant YyRr is test cross with double recessive parent A. 9:3:3:1 ratio of phenotypes B. 9:3:3:1 ratio of genotypes only C. 1:1:1:1 ratio of phenotypes only D. 1:1:1:1 ratio of phenotypes and genotypes? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is correct for the condition when plant YyRr is test cross with double recessive parent A. 9:3:3:1 ratio of phenotypes B. 9:3:3:1 ratio of genotypes only C. 1:1:1:1 ratio of phenotypes only D. 1:1:1:1 ratio of phenotypes and genotypes?.
Which of the following is correct for the condition when plant YyRr is test cross with double recessive parent A. 9:3:3:1 ratio of phenotypes B. 9:3:3:1 ratio of genotypes only C. 1:1:1:1 ratio of phenotypes only D. 1:1:1:1 ratio of phenotypes and genotypes? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Which of the following is correct for the condition when plant YyRr is test cross with double recessive parent A. 9:3:3:1 ratio of phenotypes B. 9:3:3:1 ratio of genotypes only C. 1:1:1:1 ratio of phenotypes only D. 1:1:1:1 ratio of phenotypes and genotypes? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is correct for the condition when plant YyRr is test cross with double recessive parent A. 9:3:3:1 ratio of phenotypes B. 9:3:3:1 ratio of genotypes only C. 1:1:1:1 ratio of phenotypes only D. 1:1:1:1 ratio of phenotypes and genotypes?.
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Which of the following is correct for the condition when plant YyRr is test cross with double recessive parent A. 9:3:3:1 ratio of phenotypes B. 9:3:3:1 ratio of genotypes only C. 1:1:1:1 ratio of phenotypes only D. 1:1:1:1 ratio of phenotypes and genotypes?, a detailed solution for Which of the following is correct for the condition when plant YyRr is test cross with double recessive parent A. 9:3:3:1 ratio of phenotypes B. 9:3:3:1 ratio of genotypes only C. 1:1:1:1 ratio of phenotypes only D. 1:1:1:1 ratio of phenotypes and genotypes? has been provided alongside types of Which of the following is correct for the condition when plant YyRr is test cross with double recessive parent A. 9:3:3:1 ratio of phenotypes B. 9:3:3:1 ratio of genotypes only C. 1:1:1:1 ratio of phenotypes only D. 1:1:1:1 ratio of phenotypes and genotypes? theory, EduRev gives you an
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