標題:
幾條 bio mc question (genetics)
發問:
有幾條mc唔明..有答案...可唔可以explain下...1. An embryo resulting from the mating of two silver-coated foxes is transported into the uterus of a red-coated fox. The resulting offspring will be ...A. red-coatedB. silver-coatedC. red-coated with silver spotsD. silver-coated with red spotsANS:... 顯示更多 有幾條mc唔明..有答案... 可唔可以explain下... 1. An embryo resulting from the mating of two silver-coated foxes is transported into the uterus of a red-coated fox. The resulting offspring will be ... A. red-coated B. silver-coated C. red-coated with silver spots D. silver-coated with red spots ANS: silver-coated (Why?) 2. Which of the following characteristics is NOT affected by environmental factor? A. height B. skin colour C. intelligence quotient D. tongue-rolling ability ANS: tongue-rolling ability (intelligence quotient 會affect倒架咩?) 3. If A' resulted from a mutation of gene A, the mutation is most likely to have taken place in A.the ovary of mouse Y. B.the ovary of the parent of mouse Y. C.the skin of mouse Y. D.the skin of the parent of mouse Y. ANS: B (唔明條題目問乜...) 4. In a population of mice, it is found that 80% of the mice are black-coated and 20% are white-coated. Which of the following shows the probable changes in the percentages of black mice and the white mice in the following environments after one year? Dark leafy area White sandy area Black mice White mice Black mice White mice A.90%10% 70% 30% B.70%30% 90% 10% C.90%10% 90% 10% D.70%30% 70% 30% ANS: A (唔明) 5. Some of the following hereditary diseases are caused by the defect of a gene. Which are they? (1) Down's syndrome (2) haemophilia (3) colour-blindness ANS: (2) and (3) (點解(1)唔係?????) 6. Joe and Jim are twin brothers. Which of the following characteristics of Joe and Jim allows you to determine whether they are identical twins or not? Joe Jim A. IQ 110 110 B. pulse rate 70 75 C. blood group A A D. colour vision normal colour-blind PLZ EXPLAIN... 仲有我想問 similar genotype係咩意思 RR/Rr 同 Rr 算唔算similar?? THZ very much =] !! 更新: ha....i need explanation, not translation -_- thz~ 更新 2: 唔該晒~但係你冇答到第3題既??
最佳解答:
1.b because the characters of the offspring is determined by its genetic materials which comes from and identical to 2 silver-coated foxes . 2.d 你讀多d書~iq咪高d囉 3.gene A 會mutate.causing the mutated gene A'. 依個mutation 最有可能會發生係邊? 4.原本有80%mice係黑色20%係白色. 如果依堆mice擺係好黑o既環境or擺係好白o既環境. 佢地o既population有咩change? 擺係黑到~白色係unfavourable variation 因為佢好易被predator見到食左. 但黑色可以survive and reproduce~所 以黑色變多左(有90%)白色變少左(得10%) 相反,白色mice係白色環境會survive and reproduce, 所以白色變多左(有90%)黑色只有10% 5.Down's syndrome係caused by an extra 21 chromosome but not defected genes 6.d 其實determine唔到佢地係咪identical twins 如果就咁比以上information你. 因為唔係identical twins blood group可以一樣,iq都可以一樣. 但只要有一樣phenotype(遺傳落黎)係不同.. 就可以determine佢地唔係identical twins. 就好似D.一個colour-blind 一個唔係.. 由於colour-blindness係genetic disorder. 所以咁就睇到佢地有不同genetic make up. similar genotype講緊佢地o既allele係similar. RR同Rr一樣有個dominant character 所以應該算係
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其他解答:
1. 起因于聯接的胚胎二隻銀上漆的狐狸被運輸入一隻red-coated狐狸的子宮。 发生的子孫將是… red-coated的A. 銀上漆的B. C. red-coated與銀色斑點 D.銀上漆與紅色斑點 ANS ： 銀上漆 (為什麼？) 2. 哪些以下特徵沒有影响的是否是受环境因素的？ A.高度 B.肤色 C.智商 D.舌頭輾壓能力 ANS ： 舌頭輾壓能力 (智商會影響倒架咩？) 3. 如果A起因于基因A的變化，變化是很可能發生了 老鼠Y.A.the卵巢。 老鼠Y.的父母的B.the卵巢。 老鼠Y.C.the皮膚。 老鼠Y.的父母的D.the皮膚。 ANS ： B (唔明條題目問乜…) 4
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