题目

完形填空Mike makes wonderful cakes for special occasions. You’ll be      1    by what he can do! Mike has been making cakes since he left high school. After working as a chef all around the US, he started his own      2    in 1995. Now his cake are     3     as far away as England and France.     It’s easy to see why Mike’s cakes      4   . They are all personal, and look more like works of art than food.          5    someone asks Mike to make a cake, he works with him to find the perfect design. Once, some office workers wanted a good 如图是生物生殖过程中染色体变化示意图，据图回答：（1）请画出图中精子、卵细胞、受精卵细胞中染色体和基因；（2）若图为人类生殖过程中染色体变化的示意图，图中所示的是一对性染色体，父方体细胞中性染色体组成为XY，则产生的精子有两种，分别为含______和含______性染色体，母方体细胞中的性染色体组成为______，产生的卵细胞中只含______性染色体；（3）从生殖细胞结合形成受精卵的角度看，决定生男生女的关键是由______生殖细胞所决定；从理论上讲，男女比例大致是______．