A gene is said to be dominant if:
Correct answer: C. It expresses its effect both in homozygous and heterozygous condition
- A. It expresses its effect only in homozygous state
- B. It expresses its effect only in heterozygous condition
- C. It expresses its effect both in homozygous and heterozygous condition
- D. It never expresses its effect in any condition
Explanation
A gene is considered dominant if it expresses its effect in both homozygous (two copies of the dominant allele) and heterozygous (one dominant and one recessive allele) conditions. This means that the presence of at least one dominant allele is enough to manifest the trait it encodes. Option C is correct because it accurately describes this characteristic. Options A and B are incorrect as they misrepresent the expression patterns of dominant genes, and Option D is incorrect as it describes a scenario not applicable to gene expression in classical genetics.
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
If a color blind woman marries a normal visioned man, their sons will be:
Which one of the following cannot be explained on the basis of Mendel's law of dominance?
Select the correct statement from the ones given below with respect to the dihybrid cross:
Which of the following is a correct match?
Ratio of complementary genes is:
Independent assortment of genes does not takes place when: