Предмет: Биология, автор: barikmixru

Придумать и решить 3 задачи по закону Менделя
Заранее спасибо ^.^

Ответы

Автор ответа: shahira

1)Какого цвета будут розы, полученные при скрещивании двух гетерозиготных растений розового цвета? ( по второму закону Менделя)
P(F₁) Aa x Aa Aa-розовые, A-красные
Гаметы: А; а А; а а-белые
F₂ AA(красные) Аа(розовые)-аА аа(белые)
По закону расщепления признаков происходит расщепление признаков: по генотипу в соотношении 1: 2: 1, по фенотипу 3: 1

Автор ответа: shahira

2) У персика опушенный плод доминирует над гладким. Какими будут гибриды F1 и F2, если скрестить гомозиготный персик с опушенными плодами с гомозиготным персиком, который имеет гладкие плоды?

Автор ответа: shahira

сейчас решу

Автор ответа: shahira

Зная генотипы растений F1 и родителей, записываем схему скрещивания гибридов F1 с их доминантной родительской формой (обратное скрещивание): Р Вb х ВВ F3 2ВВ : 2Вb
Все зиготы имеют доминантный ген В, поэтому все потомство по фенотипу однотипное - с опушенными плодами

Автор ответа: shahira

извини, я уже засыпаю и не могу придумать третью

Автор ответа: barikmixru

И на тои огромное тебе спасибо)

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Scotland is a country in the United Kingdom to the north of England. Its symbol is a thistle; its patron is St. Andrew. The country is divided into Highlands and Lowlands. Most of the industry is concentrated in Lowlands, in the Clyde Valley. Glasgow is its largest and busiest town; Edinburgh is its capital. Glasgow and Edinburgh are the two great centres of Scotland. There is only 45 miles between them, and it will take you an hour to get from Glasgow to Edinburgh by train but the cities are very different.
Glasgow is the heart of industry. It is a centre of business and trade. It is very busy, prosperous, dirty in some parts and smart in others. It is beautiful and ugly with its large port and busy streets.
Edinburgh is rather cold but attractive, very proud but friendly and has a great past. Edinburgh is known as Athens of the North. It is an ancient city and if you walk around it, you can feel history at every step. Practically every building has a tale to tell.
The most interesting parts of the city are the Old Town and the New Town. The Old Town lies between the Castle and Holyrood Palace. The Castle hangs over the city like some Disney cartoon – but it is real. The Castle, in fact, is older than the city. No one can say exactly say when the first settlers came to live on the huge rock that stands high above Edinburgh. Later they built a castle that used to be a fortress and then a royal palace. It looks good in any weather but at night when it is floodlit it looks just like a castle in a fairy tale. It is not surprising that the Castle attracts a lot of tourists. The Edinburgh military tattoo takes place every August and September and is known throughout the world. For 90 minutes on five or six nights a week, 600 people perform in the square in front of the Castle.
The performers play military music and march to it. At the same time as the tattoo, you can go to the famous Edinburgh festival. The festival started in 1947. Every year the best performances from all over the world can be seen in Edinburgh.

A line of streets, which runs from the Castle to Holyrood House, is called the Royal Mile. Holyrood House is a big royal palace which is the residence of the Queen when she is in Edinburgh. The most picturesque part of the Royal Mile is the Cannongate, which gives a good idea of what the Old Town was like. Closes (narrow passages) lesd to little years and attractive historical buildings. One of the most modest and yet one of the best known monuments in Edinburgh is a monument to a dog called Bobby. The dog belonged to John Gray. When he died Bobby lived near his grave for twenty-six years. Later Bobby was buried near his master and his statue in the Old Town has become a symbol of devotion. The Old Town is a striking contrast to the New Town with its white and beautiful streets lined with trees. Princes Street is the most beautiful street of the New Town. It has at lot of gardens on one side and it is also Edinburgh’s popular shopping centre. Princess Street is connected with the name of the famous writer, Sir Walter Scott. A monument 200 feet high rises among green trees. They call it a poet of stone. It is the Scott monument. Inside it there is a marble statue of the writer, and of his favourite dog.
Princess Street lies between the New Town and the Old Town. The modern town is on the lower side, the old one – on the higher. They look at each other across the valley under Scotland’s blue sky.