A:二者形成过程中都出现联会、四分体、同源染色体分离、非同源染色体自由组合现象
B:基因型为AaBbCc(三对等位基因分别位于三对同源染色体上)的一个初级精母细胞和一个初级卵母细胞分别产生的精子和卵细胞基因型的种类数比为4:1
C:精子和卵细胞形成过程中不同的地方是精子需变形,卵细胞不需要变形,其余完全相同
D:形成100个受精卵,至少需要100个精原细胞和100个卵原细胞
下列对土地资源利用现状的说法,正确的是( )
阅读短文,回答问题。
Dear Amy,
I want to 1 your friend. Let me introduce my family to you. My father is a doctor. He is tall 2 strong. My mother is a teacher. She is think and kind. My brother Sam is 6 years old. He's short and funny. We 3 in a big city. However, we usually go 4 on the weekends. I have a small and nice room. There is a bed and a desk in my room. I like reading books. I have many books 5 my desk. Welcome to my home.
Yours,
Lucy
下图反映的气候类型分布在( )