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生物 高校生

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Test II PROBLEM SOLVING Directions: Answer the question and show your complete solution in the separate paper. 1. Suppose the cells lining of your cheeks can completely di vide every 24 hours. Assuming no cells die in the process, how many cheek cells will be there after 7 days if you started with 5 cheek cells? 2. If an organism has 15 pairs of homologous chromosomes, how many chromosomes will each daughter cell have after telophase of mitosis? Test I. Complete the concept in mitosis has the Cell division Purpose of which have occurs in through (10. condeneed which Includes or noncondensed which include 5。 温 a loop of DNA which Includes (in order) which form sister 9. during 12. (13. 14. which is followed by 15. which Is followed by (16. which includes (in order). 17. 19. >(20. What's New In meiosis the cell goes through similar stages in mitosis and uses similar strategies to organize and separate chromosomes. However, the cell has a more complex task in meiosis. It still needs to separate sister chromatids (the two halves of a duplicated chromosome), as in mitosis. But it must also separate homologous chromosomes, the similar but non-identical chromosome pairs an organism receives from its two parents. These goals are accomplished in meiosis using a two-step division process. Homologue pairs separate during a first round of cell division, called meiosis I. Sister chromatids separate during a second round, called meiosis III. Since cell division occurs twice during meiosis, one starting cell can produce four gametes (eggs or sperm). In each round of division, cells go through four stages: prophase, metaphase, anaphase, and telophase. Stages of Meiosis I In meiosis I, homologous chromosomes are separated into two cells such that there is one chromosome (consisting of

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英語 高校生

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[分詞構文の用法] 各文の下線部を分詞構文にしなさい。 (1) When she entered the roonm, she found the boys smoking. Entering the koakn_ (2) Though I live near famous ski areas, I can't ski at all. she found the boys smoking. -Living nCer famous ski arcas. I can't ski at all. (3) Because I got up so early this morning, I felt very sleepy. Gerting.up. se carly. Ihis. morming (4) Because he did not want to fail the test, he studied without sleeping. I felt very sleepy.. Not being wanted to feil the_ test (5) Though I did not receive a letter back from her, I wrote to her again. he studied without sleeping. Netrece ining e letter beck from her Iwrote to her again. (6) She waved her hand, aid she walked' away. Waving her hend (7) If you turn tó the right, you can find the movie theater. she walked away. Luzning the (8) Because the elevator was out of order, all of us had to walk. bight you can find the movie theater. all of us had to walk. (9) Because I had heard the joke many times, I could not laugh. Heard the jokel many. times (10) As I have finished my homework, I am watching TV now. I could not laugh. Hlaving finished (1) When they are seen from the sky, the cars look like toys. Iam watching TV now. my hanework be ing seen tkom the ste (12) If we judge from the look of the sky, it is going to rain soon. the cars look like toys. frem the lack of the sky. it is going to rain soon. durdging. (13) As it was sunny, we went on a picnic. It been sunny we went on a picnic. (14) Because night came on, she went indoors. she went indoors.

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