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How many offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits. The traits behave in dominant and recessive pattern. Also give the number of phenotypes.
- a)64 genotypes ; 16 phenotypes
- b)16 genotypes ; 64 phenotypes
- c)8 genotypes ; 27 phenotypes
- d)27 genotypes ; 8 phenotypes
Correct answer is option 'D'. Can you explain this answer?
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How many offspring genotypes are expected in a trihybrid cross between...
The number of genotypes in trihybrid cross is given by 3n where n = number of genes
Number of genes here = 3
∴ 3n = 33 = 27
Hence 27 genotypes.
Number of genes here = 3
∴ 3n = 33 = 27
Hence 27 genotypes.
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How many offspring genotypes are expected in a trihybrid cross between...
Understanding Trihybrid Crosses
In a trihybrid cross, we consider three traits that follow Mendelian inheritance, specifically with each trait having a dominant and a recessive allele. When both parents are heterozygous for all three traits (AaBbCc x AaBbCc), we can determine the expected offspring genotypes and phenotypes.
Calculating Genotypes
- Each trait has two alleles (dominant and recessive), leading to the following combinations:
- Trait A: AA, Aa, aa
- Trait B: BB, Bb, bb
- Trait C: CC, Cc, cc
- Thus, for three traits, the combinations can be calculated as:
- Total genotypes = 3 (for A) x 3 (for B) x 3 (for C) = 27 genotypes
Calculating Phenotypes
- Each trait can express one of two phenotypes (dominant or recessive):
- Trait A: Dominant (A_) or Recessive (aa)
- Trait B: Dominant (B_) or Recessive (bb)
- Trait C: Dominant (C_) or Recessive (cc)
- Therefore, the total number of distinct phenotypes is calculated as:
- Total phenotypes = 2 (for A) x 2 (for B) x 2 (for C) = 8 phenotypes
Conclusion
From the calculations, we find:
- Total Genotypes: 27
- Total Phenotypes: 8
Thus, the correct answer is option 'D': 27 genotypes and 8 phenotypes. This aligns with Mendelian genetics principles, showcasing the diversity in offspring from a trihybrid cross.
In a trihybrid cross, we consider three traits that follow Mendelian inheritance, specifically with each trait having a dominant and a recessive allele. When both parents are heterozygous for all three traits (AaBbCc x AaBbCc), we can determine the expected offspring genotypes and phenotypes.
Calculating Genotypes
- Each trait has two alleles (dominant and recessive), leading to the following combinations:
- Trait A: AA, Aa, aa
- Trait B: BB, Bb, bb
- Trait C: CC, Cc, cc
- Thus, for three traits, the combinations can be calculated as:
- Total genotypes = 3 (for A) x 3 (for B) x 3 (for C) = 27 genotypes
Calculating Phenotypes
- Each trait can express one of two phenotypes (dominant or recessive):
- Trait A: Dominant (A_) or Recessive (aa)
- Trait B: Dominant (B_) or Recessive (bb)
- Trait C: Dominant (C_) or Recessive (cc)
- Therefore, the total number of distinct phenotypes is calculated as:
- Total phenotypes = 2 (for A) x 2 (for B) x 2 (for C) = 8 phenotypes
Conclusion
From the calculations, we find:
- Total Genotypes: 27
- Total Phenotypes: 8
Thus, the correct answer is option 'D': 27 genotypes and 8 phenotypes. This aligns with Mendelian genetics principles, showcasing the diversity in offspring from a trihybrid cross.
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How many offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits. The traits behave in dominant and recessive pattern. Also give the number of phenotypes.a)64 genotypes ; 16 phenotypesb)16 genotypes ; 64 phenotypesc)8 genotypes ; 27 phenotypesd)27 genotypes ; 8 phenotypesCorrect answer is option 'D'. Can you explain this answer?
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How many offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits. The traits behave in dominant and recessive pattern. Also give the number of phenotypes.a)64 genotypes ; 16 phenotypesb)16 genotypes ; 64 phenotypesc)8 genotypes ; 27 phenotypesd)27 genotypes ; 8 phenotypesCorrect answer is option 'D'. Can you explain this answer? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about How many offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits. The traits behave in dominant and recessive pattern. Also give the number of phenotypes.a)64 genotypes ; 16 phenotypesb)16 genotypes ; 64 phenotypesc)8 genotypes ; 27 phenotypesd)27 genotypes ; 8 phenotypesCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for How many offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits. The traits behave in dominant and recessive pattern. Also give the number of phenotypes.a)64 genotypes ; 16 phenotypesb)16 genotypes ; 64 phenotypesc)8 genotypes ; 27 phenotypesd)27 genotypes ; 8 phenotypesCorrect answer is option 'D'. Can you explain this answer?.
How many offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits. The traits behave in dominant and recessive pattern. Also give the number of phenotypes.a)64 genotypes ; 16 phenotypesb)16 genotypes ; 64 phenotypesc)8 genotypes ; 27 phenotypesd)27 genotypes ; 8 phenotypesCorrect answer is option 'D'. Can you explain this answer? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about How many offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits. The traits behave in dominant and recessive pattern. Also give the number of phenotypes.a)64 genotypes ; 16 phenotypesb)16 genotypes ; 64 phenotypesc)8 genotypes ; 27 phenotypesd)27 genotypes ; 8 phenotypesCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for How many offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits. The traits behave in dominant and recessive pattern. Also give the number of phenotypes.a)64 genotypes ; 16 phenotypesb)16 genotypes ; 64 phenotypesc)8 genotypes ; 27 phenotypesd)27 genotypes ; 8 phenotypesCorrect answer is option 'D'. Can you explain this answer?.
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