The gene for blue opsin is present on which chromosome?
Correct answer: A. 7
- A. 7
- B. 6
- C. 8
- D. 11
Explanation
The gene encoding the blue pigment (OPN1SW) is located on the long arm of chromosome 7. OPTION A: The gene for blue opsin, which is involved in color vision, is located on chromosome 7. This chromosome is one of the 23 pairs of chromosomes found in humans and is designated as "chromosome 7" based on its size and other distinguishing features. The blue opsin gene, along with other opsin genes responsible for different color perception, is crucial for the proper functioning of the photoreceptor cells in the eye and is specifically located on chromosome 7. OPTION B: Chromosome 6 is functionally associated with more than 120 major human diseases, including cancer, heart disease, infectious, immune, and inflammatory disorders, and mental illnesses. OPTION C: Chromosome 8 contains 700 genes and is important for the normal formation of the brain and some developmental variations, such as small head size or skull and facial differences. OPTION D: The insulin gene is located on the short arm of chromosome 11 in humans.
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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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