Pure-breeding yellow guinea pigs crossed with pure-breeding white ones produce only cream-colored
offspring. This pattern indicates incomplete dominance. Rough hair is found to be dominant to smooth
hair. Give the F1 and F2 genotypic and phenotypic ratios of a cross of a smooth, white guinea pig with
a homozygous, rough, yellow guinea pig. What will be an ideal response?
F1: rough cream Yy Rr; F2: 3 YY R_ yellow rough, 6 Yy R_ cream rough, 3 yy R_ white rough, 1 YY rr
yellow smooth, 2 Yy rr cream smooth, 1 yy rr white smooth
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Which of the following is not a step in nonhomologous end joining?
A. phosphorylation of the Ku70-Ku80 complex B. degradation of any single-strand overhangs or hairpins from the broken ends of the chromosomes to be repaired C. binding of the Ku70-Ku80 complex to the broken chromosome ends D. binding of a kinase and a nuclease to the Ku70-Ku80 complex on the DNA E. All of the steps given occur in NHEJ.
The immunoglobulin monomer consists of
A. four large chains. B. two heavy and two light chains. C. five light chains. D. three heavy and three light chains.
Which of the following develops into a seed?
a. megaspore b. ovary c. egg d. ovule e. anther
During which phase does the corpus luteum form?
a. menstrual b. progestational c. proliferative d. ovulatory e. pregnancy