Distinguish between quantitative and qualitative variation
What will be an ideal response?
Both types of variation describe phenotypic variation. Quantitative traits are those that vary in small,
incremental ways. Qualitative traits are those that exist in two or more discrete states.
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Whether during mitosis or meiosis, sister chromatids are held together by proteins referred to as cohesins. Such molecules must _____
A) persist throughout the cell cycle B) be removed before meiosis can begin C) be removed before sister chromatids can separate D) reattach to chromosomes during G1 E) be intact for nuclear envelope re-formation
In rabbits, there are four alleles at the c locus. Arranged in dominance sequence they are C (agouti), cch (chinchilla), ch (Himalayan), and c (albino) ? Which of the following crosses will NOT be possible? ?
A. Two agouti rabbits to produce both chinchilla and Himalayan offspring B. Two chinchillas to produce 1/2 chinchilla and 1/2 Himalayan C. Two albino rabbits to produce all albino rabbits D. One Himalayan and one chinchilla to produce chinchilla rabbits E. One agouti and one chinchilla to produce agouti rabbits
The control section containing Coccidioides immitis shows very pale pink-stained organisms on the PAS stain. This is most likely the result of:
a) prolonged time in the Schiff reagent b) inadequate time in the sulfurous rinse solution c) too long in the running tap water d) old or overused reagents
The mesenchymal capsule of the optic cup forms.
A. 1 Layer of Vascular Choroid B. 1 Layer of Fibrous Sclera C. 2 Layers: 1 Inner Layer of Fibrous Sclera + 1 Outer Layer of Vascular Choroid D. 2 Layers: 1 Outer Layer of Fibrous Sclera + 1 Inner Layer of Vascular Choroid E. 2 Layers: 1 Outer Layer of Fibrous Sclera + 1 Inner Layer of Photoreceptors