Practice questions covering chromosomal theory, gene linkage, recombination, and techniques used to map genes on chromosomes. Useful for students preparing for genetics exams.
Edward’s syndrome is caused by trisomy of chromosome 18, leading to severe developmental issues.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
Henking discovered the X-chromosome while studying insect spermatogenesis.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
Linkage occurs when genes close to each other on the same chromosome are inherited together.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
A dominant allele is expressed in both homozygous (AA) and heterozygous (Aa) conditions.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
Thomas Hunt Morgan worked on Drosophila and discovered linkage and recombination.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
Sutton and Boveri proposed the Chromosomal Theory of Inheritance, linking Mendel’s principles to chromosome behavior.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
Dominant traits are not necessarily more common; frequency depends on factors like natural selection and genetic drift.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
Thomas Hunt Morgan discovered sex-linked inheritance by studying eye color inheritance in Drosophila melanogaster.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
Thomas Hunt Morgan’s experiments on Drosophila melanogaster led to the discovery of linkage and recombination.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
Recombination during meiosis is a major source of genetic variation along with mutation and gene flow.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
Linked genes do not always segregate independently; they tend to be inherited together.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
Some genes have more than two alleles, as seen in the ABO blood group system.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Chromosomal Theory Linkage Recombination Gene Mapping
