What Takes Place During Metaphase I? - spindle apparatus - homologue pairs
What will be an ideal response?
- The spindle apparatus appears
- The homologue pairs of chromosomes align at the equator. But because, they are in pairs, the line will not be single, unlike Metaphase in Mitosis and Metaphase II in Meiosis
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Where is the CFTR gene expressed at the highest levels?
a. lungs b. reproductive system c. intestines d. brain e. skin
Blood vessels show which sign of aging?
a. elastin fibers in their walls are replaced by collagen or calcium deposits b. they become softer and expand more easily c. the smooth muscle layer constricts more readily d. elastin fibers double in quantity e. veins develop more valves
Why might the sex ratio of bird species in the figure change from as they grow from juveniles to adults?
A) Nesting females are vulnerable to predatory attack. B) Males that are unable to mate die quickly. C) Females are less able to feed effectively as juveniles. D) More females are required to sustain the population.
CRISPR systems have been used in cancer treatments to
A. deliver radiation to individual cells within large, dense tumors. B. inactivate faulty genes that are responsible for the cell cycle, causing them to slow down or stop cell division. C. activate genes that are responsible for the cell cycle, causing them to speed up cell division to replace cells lost to other cancer treatments. D. deliver packets of chemicals to tumors via genetically engineered red blood cells.