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Introduction:
Genes are a functional unit of heredity. They are passed on from parent generation to the progenies. Genes consist of DNA sequences that pass on specific information regarding cellular functioning. Genes are responsible for the synthesis of different types of proteins that perform the required function in the body.
Answer to Problem 1SQ
Correct answer:
The expression of a gene may depend on the type of organism, environmental conditions, and the type of cell. Hence, the correct answer is option d.
Explanation of Solution
Reason for correct answer:
Option d. is given as “all of the above.”
Gene expression depends on the type of organism. Some genes (such as insulin coding genes) are active in only a few animal species. Specific types of cells secrete certain proteins. Some of the hormonal proteins are secreted under specific environmental conditions. Gene expression depends on various factors, such as the type of organism, cell type, and environmental conditions.
Reason for incorrect answer:
Option a. is given as, “the type of organism.”
Not all the genes are expressed in all the organisms. Expression of genes depends on the type of organisms. Along with this, certain specific genes are expressed only in specialized cells. This makes the expression of genes dependent on the type of cell as well. Hence, option a. is incorrect.
Option b. is given as, “environmental conditions.”
Genes coding for certain hormonal proteins are expressed under specific environmental conditions. Not all the hormones are secreted in all species. This also makes gene expression dependent on the type of organism. Hence, option b. is incorrect.
Option c. is given as, “type of cell.”
Some genes are secreted in specific types of cells, for example, oncogenes are active only in tumor cells. Under certain environmental conditions, also, particular genes are activated. Hence, option c. is incorrect.
Hence, the options a., b., and c. are incorrect.
The type of organism, environmental conditions, and the type of cell, all determines the expression of a gene in an organism. Thus, the correct option is d.
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Chapter 10 Solutions
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