Locus stands for:
Correct answer: E. A and C
- A. Position of gene on homologous chromosomes
- B. Regions of chromosomes
- C. Position of an allele within a DNA molecule.
- D. Close regions of the same chromosomes
- E. A and C
Explanation
The correct answers are Options A and C. A locus refers to the specific position of a gene on a chromosome, and homologous chromosomes have the same genes at the same loci, but may carry different alleles, which is covered by both options. Option B is incorrect as it does not specify the precise nature of a locus. Option D is incorrect as it confuses the concept of a locus with genomic proximity unrelated to specific gene positions.
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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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.
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