问题
填空题
李华有耳垂,母亲也有耳垂,但李华的两个姐妹无耳垂,请回答下列问题。
(1)耳垂特征在遗传学上称为________。
(2)李华母亲有耳垂,他也有耳垂,这是一种________现象;李华母亲有耳垂,他的两个姐妹无耳垂,这是一种________现象。
(3)李华体细胞的染色体数是46条,那么他母亲通过配子给他______条染色体。
答案
(1)性状
(2)遗传、变异
(3)23
李华有耳垂,母亲也有耳垂,但李华的两个姐妹无耳垂,请回答下列问题。
(1)耳垂特征在遗传学上称为________。
(2)李华母亲有耳垂,他也有耳垂,这是一种________现象;李华母亲有耳垂,他的两个姐妹无耳垂,这是一种________现象。
(3)李华体细胞的染色体数是46条,那么他母亲通过配子给他______条染色体。
(1)性状
(2)遗传、变异
(3)23
完形填空。 | ||||
Canada is the second largest country is the world. It is over 7,000 kilometres from the __1__ coast to the east. It __2__ six time zones. __3__ it is 9 a. m. in Vancouver on the west coast,it is 1:30 p, m. in St John's on the east coast. English and French __4___ the two main languages in Canada. About 60 percent of __5 _ people speak English, and about 25 percent speak French. More __6_ 70 percent of its population live in cities near the US border (边缘). Ottawa is the capital. Every year millions of tourists go there to __7__ museums and take part in the cultural activities. Toronto is the largest city of the country __8__ about 2. 5 million people. Montreal is __9_ second biggest French-speaking city in the world. The maple leaf (枫叶) is the national symbol of Canada. The Canadian flag has a red maple leaf on a red __10_ white background (背景). | ||||
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