Вопрос школьника по предмету Биология
Выбери два отличия Y-хромосомы от X-хромосомы:
1) у млекопитающих содержит гены, определяющие мужской пол организма;
2) имеет большие размеры;
3) содержится только в гаметах;
4) у человека содержит гены, определяющие мужской пол организма;
5) состоит из ДНК.
Ответ учителя по предмету Биология
Ответ если я помню то правельный ответ под номером 4 и 5
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KINDS OF TRAINS
Railways have two distinct kinds of trains. They are «regular» trains and «extra» trains. A regular train is a «scheduled» train, a train listed on the railway time-table. A railway has certain trains which are operated each day. They have definite times of leaving their terminals, definite times to make stops at stations and definite times for arrival at the terminals where they complete their runs. These are the regular trains. All regular trains on a railway are divided into «classes». There may be two or three or four classes of trains. When there are only two classes, the first class trains are the passenger trains, and the second class trains are the freight trains. «Extra» trains are trains which are not scheduled in the railway time-table.