Punnet square indicates that_of F2 progeny would have been homozygous round_ heterozygous round and_wrinkled, respectively:
Correct answer: A. 1/4, 2/4, 1/4
- A. 1/4, 2/4, 1/4
- B. 2/4, 1/4, 1/4
- C. 1/4, 1/4, 2/4
- D. 2/4, 1/4, 2/4
Explanation
In a monohybrid cross involving a dominant and recessive allele (e.g., round and wrinkled), the Punnett square reflects a 3:1 phenotypic ratio in the F2 generation. Specifically, the genotypic ratio is 1/4 RR (homozygous round), 1/2 Rr (heterozygous round), and 1/4 rr (wrinkled). This pattern arises due to the segregation of alleles, consistent with Mendel's laws of inheritance. Options B, C, and D suggest ratios that deviate from this expected pattern, incorrectly representing the distributions of genotypes.
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
Pick up the dominant one among the following traits of Pisum sativum:
A person suffering from blue cone monochromacy (BCM) will be:
Queen Victoria's hemophiliac son was prince:
What is depicted from the results of the test cross given here below? Round = 50%, Wrinkled = 50%.
When an effect caused by a gene or gene pair at one locus interferes with or hides the effect caused by another gene or gene pair at another locus, such phenomenon of gene interaction is called:
The cells of _ contain an enormous amount of DNA.