With the end of the 20 17 college entrance examination mathematics subject, what parents and candidates want to know most is nothing more than the answers to the college entrance examination mathematics questions. Below, I will provide you with the questions and answers of the 20 17 national college entrance examination comprehensive science paper for parents and students' reference, and wish the college entrance examination students good results this year.

6. The red-eye gene (R) of Drosophila is dominant to the white-eye gene (R) and located on the X chromosome; The long-winged gene (b) is dominant to the residual-winged gene (b) and located on the autosome. At present, a red-eyed long-winged Drosophila is mated with a white-eyed long-winged Drosophila, and the male Drosophila in F 1 Zhong 1/8 is left with white-eyed wings. The following statement is wrong (b).

A. the genotype of the parent female fly is BbXRXr.

B.F 1, the probability of male winged fly is 3/ 16.

C the proportion of gametes containing Xr produced by female and male parents is the same.

Female flies with white eyes and broken wings can form bXr genotype polar bodies.

7. The following daily necessities are mainly made of synthetic fibers (A)

A. nylon rope B. rice paper C. cashmere sweater D. cotton shirt

8. The process of arsenic smelting is described in Yi Yan of Materia Medica: "The method of arsenic extraction is to put raw arsenic on the fire, cover it with a container, make the cigarette fly away with the cover, and then condense and droop like milk, and the tip will win, and then it will be flat and short." The operation method involved in this paper is (a)

A. distillation, sublimation, dry distillation and extraction

The above are some questions and answers of a comprehensive science examination paper in the national college entrance examination for reference only.