AP生物考试真题解析！

还有两个月就要面临官方AP生物考试拉，即将开始进行模考，今天想给同学们带来一些备考AP生物的干货小技巧，对21年的AP生物考试真题进行解析。希望对临考的同学有所帮助。

(题目选自2014年AP生物真题; MC24)

文字版解析如下：

答案：B

考点：

1. Pedigree Analysis

2. Applying Punnett Squares to Calculate Probabilities

解题思路：

1. Determine the genotype of the affected male in the third generation

2. Use a Punnett Square and cross the affected male with a carrier female

3. Calculate probability of son being affected with the disorder

解题步骤：

- Determine if the disorder is autosomal or sex-linked

o There is a disproportionate number of affected males vs. females. All of the individuals with the disorder (shaded symbols) are males. There are no affected females. This indicates a sex-linked disorder.

- Determine if the disorder is dominant or recessive

o The parents in generation I do not have the disorder, but 2 of their sons in generation II have the disorder. When affected individuals have unaffected parents, it indicates a recessive disorder.

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