Which of the following is true of this person?
1.The person must be female because the mosaic pattern results from X inactivation.
2.The gene for the darker color is on the Y chromosome so one X chromosome is inactivated.
3.The darker color is expressed from the Barr body.
4.Dosage compensation ensures that there are equal numbers of light and dark skin cells.
1
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Which of the following statements is false?
A. The walls of the right ventricle are thicker than the walls of the left ventricle. B. Blood pressure in the pulmonary circulation is lower than blood pressure in the systemic circulation. C. The left ventricle pumps oxygenated blood, whereas the right ventricle pumps deoxygenated blood. D. The systemic blood pressure of a bird is much higher than that of a fish. E. None of the answer options is false.
After conjugation between an F+ cell and an F- cell, does the F- cell remain as F- or does it become F+? After
conjugation between an Hfr cell and an F- cell, does the F- cell remain as F- or does it become F+? Explain each answer.
What will be an ideal response?The choice of whether a particular organism belongs to the experimental group or the control group should be based
on
a. age. b. size. c. chance. d. history. e. gender.
Air is continuously forced through tubes that thread through vascularized tissue in a pair of inelastic lungs in _____
a. some fish b. amphibians c. birds d. reptiles e. some small mammals