A male inherits his X-linked allele from his mother.
Answer the following statement true (T) or false (F)
True
A man will inherit his mother's X chromosome and its associated alleles from his mother. He will inherit a Y chromosome and associated alleles from his father.
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Which variation could be subject to natural selection?
A) A dog with short legs due to malnutrition is able to crawl into holes better than his littermates. B) A tree is not infested by a ground-dwelling beetle when the homeowner cuts the lower branches. C) A hyena is born with a spotted fur pattern that allows it to hide in the grass better than its littermates. D) A pigeon learns that when its keeper comes near it will get fed.
What is the correct order of events that occur during muscle contraction?
1) muscle shortens 2) calcium binds to troponin 3) filaments slide 4) T tubules are depolarized 5) acetylcholine is released 6) ATP molecule is split a. 4 ? 5 ? 2 ? 1 ? 3 ? 6 b. 4 ? 2 ? 5 ? 6 ? 1 ? 3 c. 5 ? 2 ? 4 ? 1 ? 6 ? 3 d. 6 ? 2 ? 5 ? 4 ? 3 ? 1 e. 5 ? 4 ? 2 ? 6 ? 3 ? 1
What does the following figure illustrate? (Each dot represents a pair of Drosophila species)
A. The strength of prezygotic isolation increases more rapidly between sympatric pairs of species than it does between allopatric pairs B. Drosophila species are more likely to diverge in sympatric distributions C. Genetic distance is greater in allopatrically speciating lineages D. Reinforcement of genetic reproductive isolation is more of a factor in speciation between allopatric than sympatric pairs
A forest community is made up of thousand of species of organisms and can exist practically unchanged for hundreds of years. This stability is due to the
a. diversity of organism present b. abundance of insects that feed on plants c. changes in the climate of the area d. lack of decomposers in the forest