** Biết A quy định thân cao, a: thân thấp; B quy định hoa kép, b: Hoa đơn; D quy định màu tím, d: Màu trắng. Cho hai cá thể bố mẹ giao phối với nhau có kiểu gen AaBbDd x aaBbdd.

Loại kiểu hình (A-B-D-) xuất hiện ở F₁ với tỉ lệ là:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Từ một hộp chứa  quả cầu màu đỏ và  quả cầu màu xanh, lấy ngẫu nhiên đồng thời 3 quả cầu. Xác suất để lấy được  quả cầu màu xanh  

• Hành vi, việc làm nào dưới đây là biểu hiện của hợp tác trong học sinh?
  
• Read the passage carefully and choose the correct answers
  Marriage nowadays is a choice people make on their own, but this has not always been the case in society. Thousands of years ago, the average lifespan was shorter than it is today. A man usually lived until he was about 40 years old, while women died even sooner because of childbirth. There were many wars and illnesses, and people had to protect themselves by having more children while they were still young. The parents lived through their children.
  Marriage was not so much a romantic love story but a business transaction, or deal. Most marriages were arranged between parents while their children were still very young. It was the custom that the fathers made the decision on whom their children were going to marry. The mothers had little say in it since they rarely made any decisions outside the household. The fathers would meet to arrange the wedding date and the money given for the bride on her wedding date. The more money and land a girl had, the more chances she had to marry well. Therefore, it was important that her father choose the bridegroom very well. Usually, it was someone who came from a good family or who was rich too. It was very unlikely that people married outside their social class. A few well-off and rich merchants got to marry poorer noblewomen and became King’s business advisors. In a way, poor peasants had an easier choice as it was less important whom they married.
  The practice of arranged marriage is still common in some countries in the Middle East, such as India or Pakistan. Here, social classes are still strongly divided and very well-kept. Often, however, arranged marriages are a sign that people do not want to let go of the past, which gives them comfort and security in an ever-changing world.
  (Adapted from Longman Essence Reading, Vol. 2)
  Question . According to paragraph 2, richer girls were more likely to ______.
  

• Phương trình nào sau đây có tập nghiệm trùng với tập nghiệm của phương trình ?                         

• Tất cả các loại đối tượng lao động, dù trực tiếp hay gián tiếp đều
  

• Cho 10 ml dung dịch muối Canxi tác dụng với lượng dư dung dịch Na₂CO₃, lọc lấy kết tủa nung đến khối lượng không đổi thu được 0,28g chất rắn. Nồng độ mol của ion canxi trong dung dịch ban đầu là:  

• Bình quân lương thực theo đầu người của Ấn Độ còn thấp, nguyên nhân chủ yếu là do

• He did his best in everything , _______he would not have been what he was.

• ______ you wanted to ask your teacher a question during his lecture, what would you do?

• Bangkok is ________ capital of Thailand and I’ve been there twice.