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  4. Mammary glands are modified :

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Q. Mammary glands are modified :

Uttarkhand PMTUttarkhand PMT 2004

Solution:

Mammary glands are modified sweat glands. They occur on all female mammals and in a rudimentary form on all male mammals. In the human female, the mammary glands start to increase in size at puberty because of fat accumulation and reach their maximum development in approximately the twentieth year. These undergo additional development during pregnancy.