<p>2 practice ques. that i had trouble on:</p>
<li>What experiment would best test the goslings capacity for intuitive reasoning?
(A) Placing their food at the end of a maze
(B) Ringing a bell but no longer bringing food
(C) Providing food after a gosling presses a small switch
(D) Hanging the food out of reach with a movable step nearby
(E) Bringing more food than the goslings can eat</li>
</ol>
<p>I chose A, but the answer says D</p>
<li>this one was a pedigree ques. i won’t go through the details of the entire pedigree, but basically the disease is a X-linked recessive trait. The father and the mother phenotypically don’t show the disease. They have a girl who is also phenotypically normal. The question asks what is the probability that the daughter is a carrier?</li>
</ol>
<p>I said 50%, because although we know the father will pass down the normal gene to the daughter, no information is given about the genotype of the mother (who does not show the disease). She could be homozygous dominant or heterozygous (a carrier). Because of this she could either pass on a normal gene or a defective gene, depending on her genotype.</p>
<p>The answer: The father cannot pass the allele to the daughter. We have no information on the mother and can therefore assume she is likewise not a carrier</p>
<p>*I don’t like the word “assume” that they used…it seems iffy. do you guys agree with the answers? will they ask these types of questions on the actual exam?</p>
<p>thanks!</p>