In which of the following cases will the genotypic and phenotypic ratio remain the same in the F2 generation?
Correct answer: D. Incomplete dominance
- A. Law of independent assortment
- B. Law of Segregation
- C. Test cross
- D. Incomplete dominance
Explanation
d) Incomplete dominance:Incomplete dominance is a form of inheritance where the heterozygous phenotype is an intermediate blend of the two homozygous phenotypes. For example, when a red flower (RR) is crossed with a white flower (rr), the F1 generation will have pink flowers (Rr). If the F1 generation (pink flowers) is crossed with each other, the genotypic and phenotypic ratios in the F2 generation will be 1:2:1 (RR:Rr:rr) and 1:2:1 (red phenotype: pink phenotype: white phenotype), respectively. The ratios will remain the same because the alleles segregate independently during gamete formation.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
Practise Inheritance
1,238 free Inheritance MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Inheritance questions
A condition is known to be "X-linked dominant". An affected man and an unaffected woman have a son. What is the likelihood that the son will be affected?
A man expresses a certain X-linked recessive genetic disorder. Which of the following must be true?
If one allele is missing, the organism is:
Which of the following is a monohybrid cross?
The gene for blue opsin is present on which chromosome?
Which of the following is true regarding a test cross?