alleryIn a dihybrid cross with 9:3:3:1 ratio of offspring, what fraction shows both recessive traits?
A9 of 16
B3 of 16
C1 of 16
D1 of 4
Answer & Solution
Correct answer: C. 1 of 16
1. A dihybrid F₂ generation has 16 equally likely outcomes from the Punnett square.
2. The 9:3:3:1 phenotypic ratio groups them by visible features.
3. The number 9 corresponds to both dominant traits being expressed.
4. The two 3s each correspond to one dominant and one recessive trait.
5. The number 1 corresponds to both recessive traits expressed.
6. So one out of sixteen offspring shows both recessive traits.
_Source: syllabus Science Ch 9 'Heredity' (learncbse.in extract)_
Keep practising Unit 7B: Population Genetics & Hardy-Weinberg Evolution
Browse all Unit 7B: Population Genetics & Hardy-Weinberg Evolution questions for AP Biology, or explore more Biology topics.
Related questions
Evolution is best defined as the change occurring in living organisms that takes place:Which genetic disorder is given as an example of a condition that can be caused by a mutatA sudden change in a gene, such as a nucleotide shifting its position, is known as a:The stepwise movement of the ribosome along mRNA by a distance of one triplet codon is terThe amino acids brought in by tRNA are joined together by peptide bonds with the help of wOn a tRNA molecule, the sequence that is complementary to the codon on mRNA is called the:Which Indian-origin scientist received the 1968 Nobel Prize for his work on triplet codonsHow many nucleotides make up the triplet codon that codes for a single amino acid?