The four haploid nuclei found at the end of meiosis differ from one another in their exact genetic composition. Some of this difference is the result of
a. cytokinesis.
b. replication of DNA during the S phase.
c. separation of sister chromatids at anaphase II.
d. spindle formation.
e. crossing over during prophase I.
Ans: e. crossing over during prophase I.
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Erection occurs when
A. the spongy erectile tissue of the penis becomes engorged with blood. B. the veins flowing out of the penis vasoconstrict. C. the arteries of the penis vasodilate. D. nitric oxide is released. E. All of these events occur to promote an erection.
In Thomas Hunt Morgan's experiments, the ratio of red-eyed flies to white-eyed flies appeared to follow a simple Mendelian pattern of inheritance. What observation(s) did he make that led to his conclusion that the white-eyed trait was actually not a simple Mendelian trait?
A. He was able to correlate the expression of white eyes to the inheritance of an X chromosome. B. He saw that only males had white eyes. C. He observed that the white-eyed trait was recessive. D. He was able to correlate the expression of white eyes to the inheritance of a Y chromosome because only F2 males had white eyes and the trait is recessive. E. He was able to correlate the expression of white eyes to the inheritance of an X chromosome because only F2 males had white eyes and the trait is recessive.
Dandelions develop seeds by apomixis. What benefits does this strategy provide over vegetative or sexual reproduction?
A. Apomixis makes the dandelions more resistant to herbicides. B. Apomixis provides the benefits of seed dispersal, while maintaining a genome adapted to a given climate. C. Apomixis is beneficial in sheltered areas where wind pollination would be difficult. D. Apomixis is beneficial for plants that attract a diverse mix of bees and other pollinators. Clarify Question What is the key concept addressed by the question? What type of thinking is required? . Gather Content What do you already know about apomixis? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
An organism with the genotype of AaXx can produce gametes containing ____ if the two genes are unlinked
a. either Aa or Xx b. either AX, Ax, aX, ax c. AaXx only d. AX or ax e. A,a,X,x