give reasons for the following
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1)colour blindness is a x-linked disease as it is caused due to recessive gene on x chromosome
2)because it controls the activities of internal organs ,example peristaltic movement of alimentary canal,movement of breathing,beating of heart and many other involuntary actions
3) The menstrual cyle is the shedding of the uterine lining that would otherwise have housed a growing embryo in pregnancy. When a woman becomes pregnant, that uterine lining is necessary to house the new embryo and is retained inside the womb. Since the lining doesn't shed, the woman doesn't menstruate during her pregnancy.
4)so that they can carry more oxygen as their surface area increases and also that the oxygen is not used by those organelles
5)because arteries don't have valves
2)because it controls the activities of internal organs ,example peristaltic movement of alimentary canal,movement of breathing,beating of heart and many other involuntary actions
3) The menstrual cyle is the shedding of the uterine lining that would otherwise have housed a growing embryo in pregnancy. When a woman becomes pregnant, that uterine lining is necessary to house the new embryo and is retained inside the womb. Since the lining doesn't shed, the woman doesn't menstruate during her pregnancy.
4)so that they can carry more oxygen as their surface area increases and also that the oxygen is not used by those organelles
5)because arteries don't have valves
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