Download Questions - Kettering Science Academy

Questions
Q1.
The diagram shows the genetic inheritance of cystic fibrosis (CF) in a family.
Cystic fibrosis is a genetic disorder caused by the CF recessive allele.
(i) What is an allele?
Put a cross (
) in the box next to your answer.
(1)
A a change in a chromosome
B a characteristic caused by a gene
C an alternative form of a different gene
D an alternative form of the same gene
(ii) Both parents are carriers of the CF allele.
State the term used to describe an individual who is a carrier and has both a dominant and a
recessive allele.
(1)
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Q2.
The diagram shows a chromosome.
(i) Use words from the box to complete the sentences.
(2)
Chromosomes have sections which code for specific characteristics.
Each characteristic is coded for by a . . . . . . . . . . . . . . . .. These exist in alternative forms called.
. . . . . . . . . . . . . ..
(ii) Complete the sentence by putting a cross (
) in the box next to your answer.
In a human body cell, chromosomes are found in the
(1)
A
B
C
D
Q3.
cell membrane
cytoplasm
DNA
nucleus
Eye colour inheritance
The diagram below shows the inheritance of eye colour in a family.
The allele for brown eyes is (B) and the allele for blue eyes is (b).
* Explain why two parents with the alleles BB and bb for eye colour are unlikely to produce
offspring with blue eyes.
You should draw a genetic diagram or Punnett square to help with your explanation.
(6)
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Q4.
Height can be due to environmental and genetic variations.
State two causes of genetic variation.
(2)
1
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Q5.
(a) The diagram shows a human body cell.
Name the structures labelled Aand B.
(2)
(b) Genes code for the characteristics of an individual.
Different forms of the same gene are called alleles.
(i) Complete the sentence by putting a cross (
) in the box next to your answer.
The term used to describe an individual with two identical alleles is
(1)
A heterozygous
B homozygous
C dominant
D recessive
(ii) Blue eyes are an example of a person's physical characteristics.
State the genetic term for a person's physical characteristics.
(1)
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(c) The diagram shows the inheritance of eye colour in a family.
The allele for brown eyes is B and the allele for blue eyes is b.
(i) How many offspring have blue eyes?
Put a cross (
) in the box next to your answer.
(1)
A 1
B 2
C 3
D 4
(ii) Explain why none of the children of Jason and Jane have the genotype BB.
(2)
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(iii) Fred has an identical twin.
Explain which of the other children is Fred's identical twin.
(3)
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(Total for Question is 10 marks)
Q6.
Variation
(a) Scientists investigated one aspect of diet on the growth of six people.
When the six people were babies, they had different masses of calcium in their diets.
The height of each person was recorded when they were 10 and 18 years old.
The results are shown in the table.
(i) Complete the sentence by putting a cross (
) in the box next to your answer.
The person with the most growth between 10 and 18 years had a daily diet containing
(1)
A
300 mg calcium per day
B
700 mg calcium per day
C
900 mg calcium per day
D 1100 mg calcium per day
(ii) Calculate the average rate of growth per year between the age of 10 and 18 for person 3.
(2)
answer = ......................................................cm per year
(iii) Describe the effect of the mass of calcium in the diet of a baby on their height at the age of
10 and 18.
(3)
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(iv) Height can be illustrated by a normal distribution curve.
Give the name of this type of variation.
(1)
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(b) Height can be due to environmental and genetic variations.
State two causes of genetic variation.
(2)
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Q7.
The diagram shows a unicellular freshwater organism called Euglena.
(i) Complete the sentence by putting a cross (
) in the box next to your answer.
Using the information above, Euglena is placed in the kingdom
(1)
A Animalia
B Prokaryota
C Plantae
D Protoctista
(ii) State the function of the nucleus in the Euglena.
(1)
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(iii) Describe the function of chloroplasts in the Euglena.
(2)
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(iv) Explain why Euglena is a difficult organism to classify.
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