Fruits that develop from a flower with many separate ovaries are referred to as:
a. accessory fruits.
b. aggregate fruits.
c. dry fruits.
d. multiple fruits.
e. simple fruits.
b
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You are comparing the events of meiosis I in cells from several different organisms. You come across one species in which you do not observe any chiasmata. The best conclusion to make is
A. there is no crossing over between non-sister chromatids B. kinetochores of sister chromatids do not fuse C. the chromosome pairs will not assort independently D. chiasmata will form during meiosis II
A particular flower can be purple, blue, red, or white. A pure-breeding red plant is crossed with a pure-breeding white one, and the F1 are then crossed to produce an F2 generation. Which of the following phenotypic ratios in the F2 indicate that flower color in these plants is controlled by two genes?
A) 2:1 B) 3:1 C) 1:2:1 D) 9:3:4
Experiments on selective adhesion demonstrated
a. ectoderm cells have positive affinity for mesoderm cells but negative affinity for endoderm cells d. ectoderm cells have positive affinity for both endoderm and mesoderm cells b. ectoderm cells have negative affinity for mesoderm cells but positive affinity for endoderm cells e. endoderm cells have positive affinity for both ectoderm and mesoderm cells c. endoderm cells have positive affinity for mesoderm cells but negative affinity for ectoderm cells
A chromosome that has been broken and has lost a section has had a/an:
A) duplication. B) aneuploidy. C) deletion. D) translocation. E) inversion.