AP生物考試真題解析！

還有兩個月就要面臨官方AP生物考試拉，即將開始進行模考，今天想給同學(xué)們帶來一些備考AP生物的干貨小技巧，對21年的AP生物考試真題進行解析。希望對臨考的同學(xué)有所幫助。

(題目選自2014年AP生物真題; MC24)

文字版解析如下：

答案：B

考點：

1. Pedigree Analysis

2. Applying Punnett Squares to Calculate Probabilities

解題思路：

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

解題步驟：

- 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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