In poultry, rose comb is controlled by a dominant allele, and its recessive allele controls single comb
(a) Give the genotype and phenotype produced from crossing a pure-breeding rose comb chicken
with a pure-breeding single comb chicken.
(b) Give the results of the backcross of the F1 hybrid with both pure-breeding parents. What will be an ideal response?
ANSWER: (a) Rr, rose
(b) Rr x RR -- all rose, Rr x rr -- 1/2 rose, 1/2 single
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The molecule in the accompanying figure is the pyrimidine ____, which is typically found in both DNA and RNA
a. thymine b. adenine c. uracil d. guanine e. cytosine
How is antibody-mediated immunity different from cell-mediated immunity?
a. Antibody-mediated immunity requires lymphocytes; cell-mediated immunity does not. b. Antibody-mediated immunity is innate; cell-mediated immunity is adaptive. c. Antibody-mediated immunity is adaptive; cell-mediated immunity is innate. d. Antibody-mediated immunity requires both B and T cells; cell-mediated immunity requires T cells but not B cells. e. Antibody-mediated immunity requires T cells; cell-mediated immunity requires B cells.
As the Earth moves from the summer solstice towards the vernal equinox, the equatorial regions of the Earth will be in direct alignment with the sun.
Answer the following statement true (T) or false (F)
Blood pressure drives the first step in urine formation, called _____________________.
A. tubular reabsorption B. antidiaresis C. tubular secretion D. glomerular filtration E. aldosterone processing