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In cats, the X-linked allele O converts the black pigment found in the fur into an orange pigment. Heterozygous females are mosaics of orange and black pigmented fur. The autosomal dominant allele W prevents the deposition of any pigment at all in the fur. A white female cat is mated […]

Two immune system questions: Activated T-helper cells aid in humoral immune responses by releasing cytokines which promote antibody production, phagocytosis, neutralization and apoptosis. Which parts of this statement are false and why? I know cytokines activate B cells and cytotoxic T cells, and the interferons are cytokines as well. Membrane […]

Your organs are composed of the four tissue types; epithelial, connective, muscle, and nervous tissues. Organs are wondrous things, each one with a different function vital to the homeostasis of your body. While it is easy for us to view a particular organ as a single item, it is in […]

1. Mr. Jackson comes to the emergency room with a minor wound that has bled for several days. An examination of his medical history reveals that Mr. Jackson has hemophilia, which is caused by a deficiency of factor VIII. Your co-worker suggests that you give Mr. Jackson, some platelets to […]