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【简答题】
用基因型Aabb的玉米植株的花粉给基因型为aaBb的玉米植株授粉，根据胚乳的基因型将籽粒分类。预期将形成哪些类型的籽粒?它们的比例如
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举一反三
【单选题】Suppose you find $20. If you choose to use the $20 to go to the football game, your opportunity cost of going to the game is
A.
nothing, because you found the money.
B.
$20 (because you could have used the $20 to buy other things).
C.
$20 (because you could have used the $20 to buy other things) plus the value of your time spent at the game.
D.
$20 (because you could have used the $20 to buy other things) plus the value of your time spent at the game, plus the cost of the dinner you purchased at the game.
E.
none of the above.