This question is about selective breeding.
The table shows the main steps in the process of selective breeding.
They are not in the correct order.
A | Repeat the process over many generations. |
B | Decide which features are wanted. |
C | Choose the individuals that have the features that are wanted. |
D | Choose the offspring that have the features that are wanted. |
E | Allow the individuals to mate. |
Write the letters in the boxes below to give the correct order.
Two have been done for you.
Cows are female and are used by farmers to produce milk.
Bulls are male.
Look at the details of different varieties of cows and bulls.
Variety | Milk production | Aggressive |
Cow A | thin and watery | no |
Cow B | medium yield and creamy |
no |
Cow C |
medium yield and |
yes |
Bull A |
mother produced |
yes |
Bull B |
mother produced |
no |
Bull C | mother produced low yield |
no |
A farmer wants to produce cows that produce a high yield of creamy milk.
He does not want his animals to be aggressive.
Suggest which cow and bull he should choose to mate with each other.
Explain your answer.
cow ............. × bull .............
explanation ....................................
The graph shows the number of cows and the yield of milk per cow on farms in the USA since 1985.
2 ..........................................
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