2005 Comprehensive Examination entrance volume of biological science portion of the exam assessment
Together of ability, scientific inquiry capabilities is not easy,
MBTシューズ 販売店, but requires a little bit in peacetime training. Therefore, not only to pay attention to physics teaching penetration of ideas and methods of scientific inquiry, but also to focus and strengthen the teaching of scientific inquiry, by carefully explore the creation of situations, attention to explore the process of implementation, fully functional evaluation of the incentive, to stimulate student interest in exploring, scientific inquiry to improve student ability to nurture the spirit of the students the purpose of scientific inquiry. First, explore the creation of situations. To stimulate students interest in exploring a curiosity is a basic human trait, to explore curiosity and demand by the body of allele A and a control. In a group of free-range cattle for many years (with no angular frequency of the gene have the same angular frequency of genes), randomly selected a hornless horned bull and six cows, respectively, per cow produces only a 1 calf. In six calves,
vibram five fingers outlet, the three angular, three hornless. (1) Based on the above results can determine the relative characteristics of the dominant trait? Please briefly describe the inference process. (2) In order to determine this angle and no angle on the relative relationship between the traits were recessive,
######## oakley sunglasses, with the free-range cattle (assuming no mutations) as the experimental material,
knock off oakleys, and then a new hybrid experiments, how to? (Brief write a hybrid, the expected results and draw conclusions) knowledge points] genetic experiments (significant, hidden determine) the design, analysis and evaluation. Required to understand the capacity requirements] experiments, including experimental purposes, principles, methods and steps; have the ability to verify facts related to biology, and is able to explain experimental phenomena and results, analysis and processing; to some biological problems preliminary exploratory study. Requires theory with practice, in the new context the use of genetic separation law to solve actual production problems. At the same time the requirements for language skills and higher. Assumptions and analysis] requires students to design the experiment, is the answer to this question the dominant ideology. (1) Assuming no angle is dominant; b. Suppose the dominant angle. Then subject to the conditions in the (randomly selected a hornless horned bull and six cows) and genetic separation law,
mulberry outlet, to make experimental reasoning and argumentation. Since the two assumptions can be given the results, it is not possible to determine the significant hidden. (2) raise new questions to test the conclusions, and sometimes need to do further experiments. Purpose of the experiment (determine whether the angle which the relative relationship between the traits were recessive) an experimental principle (the method to determine the implicit explicit: a. self-heterozygous, offspring of parents without the trait recessive trait, the traits of parents dominant trait; b. homozygous self, and their offspring are homozygous) an experimental program (more on the horned cattle and horned cattle hybrids, in which there is no angle calf, there are angle is dominant, no angle is hidden; if all of the descendants of horned calf, no angle is dominant, there are hidden angle - because the parent is a multi-horned cattle on the hybridization, may contain heterozygous). The problem of logical thinking and language skills are higher, the answer is too open, score was not high. Questions are gene frequency, and has not really asked the question whether the gene frequency associated with the content or reference to the answer failed to make full use of casual working in gene frequency information, can not be said with some regret. Answer] (1) can not assume that no angle is determined Da_ dominant, then the bull's genotype Aa, 6 cows are genotype aa, the descendants of each portfolio or horned or hornless, the probability each 1 / 2.6 Total offspring combinations appear three hornless calves, three horned calf. b. Suppose the dominant angle, the bull's genotype aa, 6 cows may have two genotypes, from and Aa. There are descendants from the corner. Aa offspring or no angle or angular, the probability of each 1 / 2. Since the random combination of gametes and the small number of offspring, physical separation ratio may deviate from 1 / 2. So, as long as the cow in the head with Aa genotype is greater than or equal to three, then six combined total there will be three generations without horn horned calves and three calves. The above analysis can not determine there is no corner angle is dominant or dominant. (2) Select from the herd of horned cattle and multi-horned cattle hybridization (horned cattle × horned cattle). If the offspring hornless calf, there are angle is dominant, no angle is hidden; if all of the descendants of horned calf, no angle is dominant, recessive horned. ★ This thank Xu Yuhua, Shao Jiang, firewood and other teachers to provide materials for analysis. f Department of Education Department of Zhejiang Province, Hangzhou, Zhejiang Education Department 310003J 3100121I teaching of: Viola high school version of the ugly first period t-r toxicity
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