Class 12 Exam > Class 12 Questions > Which of the following is correct for the con...
Start Learning for Free
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?
Most Upvoted Answer
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.
Community Answer
Which of the following is correct for the condition when plant YyRr is...
Option D
|
Explore Courses for Class 12 exam
|
|
Similar Class 12 Doubts
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?
Question Description
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?.
Solutions 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? in English & in Hindi are available as part of our courses for Class 12.
Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
Here you can find the meaning 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? defined & explained in the simplest way possible. Besides giving the explanation 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?, 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
ample number of questions to practice 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? tests, examples and also practice Class 12 tests.
|
|
Explore Courses for Class 12 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup