In nematodes that are anatomical males, what specialized structures allow for mating and internal fertilization with an anatomical female?
a. renette cells
b. pharyngeal nerve ring
c. copulatory spicules
d. syncytium
c. copulatory spicules
You might also like to view...
Living at high altitudes can cause ____ as a respiratory adaptation
a. elevated erythrocyte count b. decreased number of alveoli c. decreased number of lung capillaries d. hemoglobin molecules with less affinity for O2 e. decreased erythrocyte count
In a search for new antibiotics, a previously unknown organism has been recovered from the soil. It is nonmotile and is composed of long threadlike structures formed from nucleated cells. It is not-photosynthetic and absorbs its nutrients. This organism will most likely be classified among the
A. Eukaryotes (Fungi) B. Archaea C. Eukaryotes (Algae) D. Eukaryotes (Protozoa) E. Bacteria
A woman inherits a mutant BRCA1 allele from her mother. She has an increased risk of developing breast cancer because
A. some of the cells in her body are already cancerous, meaning that no further mutations are needed for a tumor to form. B. every cell in the woman's body has a copy of the mutant BRCA1 allele. C. she still has one normal allele of the BRCA1 gene that can make up for the loss of function in the mutant allele. D. a mutation in her normal BRCA1 allele may lead to cancer, whereas a normal individual would have to acquire two mutations (one in each allele) to develop cancer. E. the normal BRCA1 allele is more likely to mutate than in an individual without a mutant BRCA1 allele.
Looking at the figure above, indicate the location of any sister taxa, outgroups, and polytomies in each of the trees (A, B, and C)
What will be an ideal response?