Identify the major trends in primate evolution
What will be an ideal response?
The following trends characterize primate evolution: increased manual dexterity, upright posture, greater reliance on sight than smell, reliance on learning (large brain and extended infant care), and modified teeth.
Analyze and Evaluate the Concepts (Essay)
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You notice that in most biology and genetics textbooks, the authors show that Gregor Mendel used flower color as one of his pairs of traits. The purple flower phenotype is dominant to the white flower phenotype
However, if you go back to Mendel's experiments, you see that he actually studied seed coat color. The purple seed coat phenotype was dominant to the white seed coat phenotype. Mendel did note that plants with purple seed coats had purple flowers and plants with white seed coats had white flowers. Is the gene for seed coat color pleiotropic because it also affects flower color, or are the seed coat color gene and the flower color gene very closely linked? To find out the answer to this question, you assume that the genes for flower color and seed coat color are different genes, and your null hypothesis is that they assort independently. You designate the flower color gene wf and the seed coat color gene sw. Plants that are WF__, SW___ have purple flowers and purple seed coats. Plants that are wf wf, ws ws have white flowers and white seed coats. You do the testcross WF wf, SW sw X wf wf, sw sw and collect 15,206 offspring. What result would tell you that the wf and sw loci are probably the same, pleiotropic locus? A. One of the offspring had white flowers and purple seed coats. B. About half of the offspring had purple flowers and purple seed coats, and all the rest had white flowers and white seed coats C. All of the offspring had purple flowers and purple seed coats. D. None of the offspring had white flowers and white seed coats.
Answer the following statements true (T) or false (F)
1. Fungi differ from plants and animals by having the spindle remaining enclosed within the nuclear envelope during nuclear division. 2. All materials passing from one hyphal cell to another must diffuse across the septal wall. 3. Reproduction by asexual spores in fungi allows dispersal to a new location but doesn't facilitate invasion of new KINDS of habitats. 4. Conidia are sexual spores produced by mushrooms. 5. Wildlife benefit from endophytes because the endophytes cause more luxuriant plant growth.
In the accompanying figure, the formation of carbohydrates from carbon dioxide and water occurs in the portion oflabeled:a
A b. B c. C d. D e. E
During fertilization in humans, _______________________
(a) a wave of Ca2+ ions is released in the fertilized egg's cytoplasm. (b) only one sperm binds to the unfertilized egg. (c) a sperm moves in a random fashion until it encounters an egg. (d) several sperm pronuclei compete in the cytoplasm to fuse with the egg nucleus.