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2018年AP生物真题及下载-简答题(FRQ)部分

2019-04-30 00:25 三立在线 admin

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摘要:计划出国留学的同学可能会问AP考试容易吗?为了让同学们更好了解AP考试,三立小编为大家整理了2010-2018年AP各科考试真题大全。AP真题分为选择题和简答题两个部分。本文,小编为大家分享的是2018年AP生物真题及下载-简答题(FRQ)部分,希望对你有所帮助! Directions: Questions 1 and 2 are long free-response questions that require about 22 minutes each to answer and

  计划出国留学的同学可能会问AP考试容易吗?为了让同学们更好了解AP考试,三立小编为大家整理了2010-2018年AP各科考试真题大全。AP真题分为选择题和简答题两个部分。本文,小编为大家分享的是2018年AP生物真题及下载-简答题(FRQ)部分,希望对你有所帮助!

  Directions: Questions 1 and 2 are long free-response questions that require about 22 minutes each to answer and are worth 10 points each. Questions 3 – 8 are short free-response questions that require about 6 minutes each to answer. Questions 3 – 5 are worth 4 points each and questions 6 – 8 are worth 3 points each.

  Read each question carefully and completely. You are advised to spend the 10 -minute reading period planning your answers. You may begin writing your responses before the reading period is over. Write your response in the space provided for each question. Only material written in the space provided will be scored. Answers must be written out in paragraph form. Outlines, bulleted lists, or diagrams alone are not acceptable.

  2018年AP生物真题及下载-简答题(FRQ)部分

  1.    Polar bears are highly adapted for life in cold climates around the North Pole. Brown bears, black bears, and pandas are found in warmer environments. Researchers collected complete mitochondrial DNA sequences from several populations of bears and constructed a phylogenetic tree to represent their evolutionary relatedness (Figure 1).

  A researcher studying adaptation in bears sequenced the nuclear gene encoding a lysosomal trafficking protein (LYST) in polar bears, brown bears, black bears, and panda bears. There are seven inferred amino acid substitutions that are found only in polar bears. Mutations that cause similar substitutions in the human LYST protein are associated with Chediak-Higashi syndrome, an autosomal recessive condition in which pigment is absent from the hair and eyes. The researcher used the inferred amino acid sequences to build the distance matrix shown in Table 1.

  2018年AP生物真题及下载-简答题(FRQ)部分

  (a)    Use the phylogenetic tree in Figure 1 to estimate the age in hundreds of thousands of years of the most recent common ancestor of all brown bears. Identify the population of brown bears to which polar bears are most closely related based on the mitochondrial DNA sequence comparison. Identify two populations whose positions could be switched without affecting the relationships illustrated in the phylogenetic tree.

  (b)    Construct a cladogram on the template to represent a model of the evolutionary relatedness among the bear species based on the differences in LYST protein sequences (Table 1). Circle the position on the cladogram that represents the out-group.

  (c)    A student claims that mitochondrial DNA sequence comparisons provide a more accurate phylogeny of bear species than do LYST protein sequence comparisons. Provide ONE piece of reasoning to support the student’s claim.

  (d)    A researcher genetically engineers a mouse strain by deleting the mouse lyst gene and replacing it with the polar bear lyst gene. Predict the most likely difference in phenotype of the transgenic mouse strain compared to the wild-type mouse strain. Justify your prediction.

  (e)    Describe how the mutation in the lyst gene became common in the polar bear population. If the lyst gene were the only determinant of fur color, predict the percent of white offspring produced by a mating between a polar bear and a brown bear.

  2018年AP生物真题及下载-简答题(FRQ)部分

2018年AP生物真题及下载-简答题(FRQ)部分2018年AP生物真题及下载-简答题(FRQ)部分2018年AP生物真题及下载-简答题(FRQ)部分2018年AP生物真题及下载-简答题(FRQ)部分2018年AP生物真题及下载-简答题(FRQ)部分2018年AP生物真题及下载-简答题(FRQ)部分2018年AP生物真题及下载-简答题(FRQ)部分2018年AP生物真题及下载-简答题(FRQ)部分2018年AP生物真题及下载-简答题(FRQ)部分

  由于涉及到很多专业的特殊符号或者公式,文章可能存在小错误,我们再此为广大学员提供高清的PDF版本,供大家免费下载!

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