Describe the procedure used for colony hybridization and why it is useful
What will be an ideal response?
Answer: Figure 11.9 of the textbook illustrates the key steps. A plate containing several different colonies can be probed for a particular sequence of interest using colony hybridization. After replica plating (to save viable cells), one replica set of colonies are lysed and their nucleic acids are bound onto a filter paper. This paper is then subjected to a traditional Southern blot using a specific nucleic acid probe. The method is useful to quickly screen many sequences for the presence of a particular gene of interest.
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Peahens prefer to mate with peacocks that have
the brightest and largest tail displays. The peacock’s tail is, in and of itself, a disadvantage to the males. It is large and cumbersome and the males are more easily caught by predators because of it. Given these facts, why isn’t the peacock’s tail selected against by natural selection?
a. peacocks lack the mutations to allow selection to work b. it is working- peacocks are slowly going extinct c. in spite of the disadvantage, peacocks with larger tails leave more offspring d. it is selected against but because a peahen gives birth to so many males, the population is not greatly affected e. this is one of those mysteries of biology
Prions cause disease by changing the way proteins ____________________. Fill in the blank(s) with the appropriate word(s)
What initiates the monthly preparation of the uterus for pregnancy?
A. Prolactin B. Estradiol C. Oxytocin D. Progesterone E. Testosterone
What are the functions of helper T cells?
What will be an ideal response?