题目

甲、乙两个具有相对性状的纯合子都发生了基因突变,它们的性状都突变成了本身性状的相对性状,突变后的甲自交后代不发生性状分离,突变后的乙自交后代发生性状分离,下列说法正确的是()A. 甲的两个基因都发生了突变,乙至少有一个基因发生了突变B. 甲的两个基因都发生了突变,乙的一个基因发生了突变C. 甲和乙都是一个基因发生了突变D. 甲和乙都是两个基因发生了突变 Every school has notice boards. Let’s see what is on the notice board of an American school.School Policy1. Fighting, saying bad words and all other bad behaviors will not be allowed.2. Hand in a note or telephone to school if your child will be absent for the day.3. Parents and visitors need to check in at the office when entering the school.Report CardReport card about your school life and work will be given to your parents. Look at the marking key for your school work. Goes beyond grade level standards 3Meets grade level standards 2Does not meet grade level standards Class AnnouncementTesting Dates:The math test is June 12.The science test is June 15.Parents Meeting:The next parents meeting is on Friday, June 22 at 7:00 p.m. in the meeting hall. After-school ProgramThe after-school programs will be open from 3:30 to 6:00 p.m. every day.3:30 - 4:30 Homework & Reading 4:30 - 6:00 ActivitiesIf you have any questions, feel free to call the school at 524 - 9752.【1】According to School Policy, visitors have to when entering the school.A.hand in a noteB.call at 524-9752C.check in at the officeD.telephone to the school【2】From , parents can get information on the parents meeting.A.School PolicyB.Report CardC.After-school ProgramD.Class Announcement【3】Report Card shows parents .A.certain school rulesB.after-school activitiesC.plans for classes and testsD.children’s school life and work