In radishes, two incompletely dominant genes control color and shape. Red and white radishes are
homozygous, while the hybrid is purple. Long and round are homozygous and, if crossed, will produce
an oval hybrid. Give the F2 genotypic and phenotypic ratio produced by crossing pure-breed red and
long radishes with white and round varieties. What will be an ideal response?
1 LL RR long red, 2 LL Rr long purple, 2 Ll RR oval red, 4 Ll RR oval purple, 1 ll RR round red, 1 ll Rr
round oval, 1 Ll rr long white, 2 Ll rr oval white, 1 ll rr round white
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With the E. coli trp operon where both repression and attenuation occur, the extent of regulation achieved by repression is ________ the extent of regulation achieved by attenuation.
A. greater than B. less than C. the same as D. Repression is not used in the regulation of the E. coli trp operon.
Animals breathe in air containing oxygen and breathe out air with less oxygen. The consumed oxygen is used:
A. in the Krebs cycle. B. in the glycolysis pathway. C. in the conversion of pyruvate to acetyl Co- A. D. in photosynthesis. E. as an electron acceptor in the respiratory electron transport chain.
Seed plants are pollinated by:
A. butterflies B. birds C. bats D. beetles E. all of the other choices provided
Which process normally occurs at the placenta?
A. Oxygen diffuses from fetal blood to maternal blood. B. Materials are exchanged between fetal and maternal blood. C. Maternal blood is converted into fetal blood. D. Digestive enzymes pass from maternal blood to fetal blood.