Principles of Inheritance and Variation questions
1199 published questions with worked solutions.
- If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease...
- A person having genotype I^AI^B would show the blood group as AB. This is because of
- The ZZ/ZW type of sex determination is seen in
- In a dihybrid cross, if you get a 9:3:3:1 ratio, it denotes that
- Mendel's law of independent assortment holds good for genes situated on the
- Occasionally, a single gene may express more than one effect. The phenomenon is called
- In a certain taxon of insects, some have 17 chromosomes and others have 18 chromosomes. The 17- and 18-chromosome-bearing...
- The inheritance pattern of a gene over generations among humans is studied by pedigree analysis. The character studied in...
- It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based...
- In the F2 generation of a Mendelian dihybrid cross, the number of phenotypes and genotypes are
- In humans, attached earlobes are a dominant feature over free earlobes, while hypertrichosis of the ear (extensive hair on the...
- The allele for pea comb (P) in chickens is completely dominant over the allele for single comb (p). The alleles for black feather...
- Study the two cases carefully: Case I — mother affected, father normal, sons always affected with the disease. Case II — mother...
- Consider the following statements regarding chromosomal aberrations and select the incorrect one(s). I. Chromosomal aberrations...
- A woman who is a carrier of a certain disease marries a man who is normal for this trait. They have five children (2 daughters...
- The crossover percentage between linked genes J and M is 20%, J and L is 35%, J and N is 70%, L and K is 15%, M and N is 50%, and...
- Assertion: A geneticist crossed two plants and got 50% tall and 50% dwarf progeny. Reason: This cross follows Mendelian law, as...
- In garden pea, the round shape of seeds is dominant over the wrinkled shape. A pea plant heterozygous for round seed shape is...
- In *Antirrhinum* (snapdragon), a red flower was crossed with a white flower, and in the F1 generation, all pink flowers were...
- Two pink-flowered snapdragon plants (Rr) are self-pollinated. The probability of the offspring having white flowers is
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