You would like to examine the product of a pcr reaction using gel electrophoresis. you have about 50 µl of pcr product, but the well can only hold 10 µl of sample. you have a 5x stock solution of loading dye which must be mixed with the pcr product to a final concentration of 1x. what is the volume of loading dye and pcr product that you will need in order to make 10 µl of the final mix? round each to the nearest microliter.

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

Which factor that affects biodiversity?