White fruit color in summer squash is influenced by a dominant allele W, while colored fruit must be
ww. In the presence of ww, a dominant gene G results in yellow fruit, and if the individual had both
recessive genes in the homozygous condition, it would be green. Give the F2 phenotypic ratios
resulting from a cross of a pure-breeding white of genotype WW GG with a green. What will be an ideal response?
12/16 W_ _ _ white, 3/16 ww G_ yellow, 1/16 ww gg green
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Chromosome number is reduced during meiosis because the process consists of
a. two cell divisions without any chromosome replication. b. a single cell division without any chromosome replication. c. two cell divisions in which half of the chromosomes are destroyed. d. two cell divisions and only a single round of chromosome replication. e. four cell divisions with no chromosome replication.
Which of the following characteristics is often associated with animals that are radially symmetrical?
A) Gastrovascular cavity B) Sessile or otherwise nonmobile C) Cephalization D) Mobility E) Mesoderm
Bone is composed of
A) living cells that secrete a surrounding matrix. B) a hard composite of phosphate and sodium ions. C) channels containing lymphoid tissue. D) hardened cartilage.
Whales originated from a terrestrial ancestor
a. true b. false