Chapter 48: Problem 2
The process by which cells undergo mitosis without a corresponding increase in cytoplasm is called: a. polarity. . b. cleavage. c. gastrulation. d. organogenesis e. induction.
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Chapter 48: Problem 2
The process by which cells undergo mitosis without a corresponding increase in cytoplasm is called: a. polarity. . b. cleavage. c. gastrulation. d. organogenesis e. induction.
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During embryonic development in many humans, the cells of the lower earlobe die resulting in an unattached earlobe. For this to occur one would deduce that: a. \(\quad C E D-3\) genes are inhibited. b. \(\quad C E D-4\) genes are inhibited. c. caspase-9 is deactivated. d. \(\quad C E D-9\) is actively expressed. e. the proteins encoded by \(B c l\) genes are inactivated.
In mammalian development: a. the morula develops into a trophoblast. b.the chorionic villi allow the blastocyst to move down the oviduct. c. the allantois takes over the work of the amnion. d. the pharyngeal arches transform into the pharynx, larynx, and nasal cavities. e. prolactin stimulates parturition.
In the development of the female sex organs: a. all ducts in the 7 -week embryo become Wolffian ducts. b. the \(S R Y\) gene is activated. c. anti-Mullerian hormone is secreted. d. the Mullerian ducts develop into oviducts. e. the mother secretes oxytocin.
In the embryonic development of the eye: a. the optic vesicle cells permanently adhere to each other to prevent movement, whereas the optic cup cells are very motile. b. signals from the optic cup trigger surface receptors on the lens placode. c. gradients determine that the ectoderm overlying the lens vesicle develops into the optic vesicle. d. microtubules powered by myosins and microfilaments powered by dyneins move the eye components around in the head region. e. cadherins function in the presence of calcium to allow the lens placode and optic cup to break apart.
Which of the following mechanisms does not contribute to zygote development? a. meiosis b. mitosis c. selective cell adhesions d. determination e. induction
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