. In this human embryo (shown in the photo), one can see the somites as segments along the length of the body. Into which structures will these somites develop?
a. spine and skull
b. internal organs and internal epidermal tissues
c. ribs, lungs, and spine muscle
d. the circulatory system
c. ribs, lungs, and spine muscle
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The letter "B" in the above figure represents
a. cortex. b. cornea. c. fovea. d. blood vessels. e. optic nerve
What cell type secretes interleukin-2 to facilitate B cell proliferation into memory B cells in addition to effector cells?
A) helper T cells B) mast cells C) macrophages D) natural killer cells E) plasma cells
Which of the following are the likely pollinators of a yellow flower with a strong, sweet odour and with "nectar guide" stripes that are best seen in ultraviolet light?
a. birds b. flies c. bats d. bees
Consider the following genetic study involving two autosomal genes. One of these, eye colour, has the dominant allele (R) for red eye colour and the recessive allele (r) for yellow eye colour. The other has the dominant allele (T) leading to paws with thumbs, while the recessive allele (t) codes for paws without thumbs. Presuming no linkage between the genes, what should be the phenotype ratio of the offspring produced by a testcross (RrTt ? rrtt)?
a. 1 red-eyed with thumbs: 1 yellow-eyed without thumbs b. 3 red-eyed with thumbs: 1 yellow-eyed without thumbs c. 1 red-eyed with thumbs: 1 yellow-eyed with thumbs: 1 red-eyed without thumbs: 1 yellow-eyed without thumbs d. 9 red-eyed with thumbs: 3 yellow-eyed with thumbs: 3 red-eyed without thumbs: 1 yellow-eyed without thum