Every organism has a definite body pattern. There are two classes of genes, namely, housekeeping genes and expression genes, which control the development of body parts of an organism. These are maternal effect genes and segmentation genes. These genes encode proteins that regulate the gene expression.

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Chapter 16, Problem 8TYK

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Every organism has a definite body pattern. There are two classes of genes, namely, housekeeping genes and expression genes, which control the development of body parts of an organism. These are maternal effect genes and segmentation genes. These genes encode proteins that regulate the gene expression.

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