Download Mendels Experiments

PLC 16 - Assessed Task
Unit No.
Topic Area
Key Concept
Simple Inheritance
in Plants and
Animals
Mendels Experiments
Name:
2
Difficulty
Class:
1. In the 1850s, Gregor Mendel carried out breeding experiments using peas.
(a) The importance of Mendel’s work was not recognised until the early 1900s.
Explain why.
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(2)
(b) A student repeated one of Mendel’s experiments.
The flow chart shows her procedure.
St Peter’s Catholic Comprehensive School – Science Department 2013
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(ii) Describe how the student could obtain a representative sample of seeds produced by the second
generation
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What is the approximate ratio of green seeds to yellow seeds in second generation
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(iii) Seed colour in peas is controlled by a single gene which has two alleles.
Use a genetic diagram to show why this ratio of yellow seeds to green seeds was produced by the
second generation.
Use the symbol A to represent the dominant allele, and a to represent the recessive allele.
(4)
(Total 8 marks)
2.Gregor Mendel reached important conclusions please say which two of these statements about his
Conclusions and life are true
1.
2.
3.
4.
5.
Heredity units are passed on from one parent only
The dominant unit will be not expressed if the recessive one is present
An heredity unit can be dominant or recessive
Heredity units are now called genes.
Mendel was treated as a great hero due to his discoveries.
Total Score
Out of:
Percentage Score
TIP – To Improve Progress
How you can make further progress
0-39% = Practice Task 1
40-79% = Improvement Task 1
80%+ = Extension Task 1
St Peter’s Catholic Comprehensive School – Science Department 2013