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Course: AQA A Level Biology 7402
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AQA A Level Biology 7402

1. Biological Molecules

0/102

2. Cell Structure

0/95

3. Exchange and Transport

0/98

4. Genetics, Variation and Interdependence

0/94

5. Energy Transfers In and Between Organisms (A Level only)

0/63

6. Organisms Respond to Changes in their Environments (A Level only)

0/93

7. Genetics, Populations, Evolution and Ecosystems (A Level only)

0/55

8. The Control of Gene Expression (A Level only)

0/72

9. Exam Guidance and Skills

0/38
Quiz

7.3.1 Genetic Variation – Exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.

Genetic variation in a sexually reproducing population arises from

mitosis only
the environment only
mutation, meiosis and random fertilisation
cloning
2.
Genetic variation in sexually reproducing organisms comes from
binary fission
cloning
mitosis only
crossing over, independent assortment and random fertilisation
3.
Genetic variation before and after a hurricane is shown. What effect is illustrated?
Founder effect
Gene flow
Directional selection
Bottleneck effect
4.
Which refers to the degree to which a phenotype is determined by genetic variation in a population?
SAT Biology - Question 232
A
B
C
D
E
5.
Compare: Quantity A is the number of chromosomes in a human cell produced by mitosis of a skin cell; Quantity B is the number of chromosomes in a human cell produced by meiosis. Which is correct?
Quantity A is greater
Quantity B is greater
The two quantities are equal
The information given is insufficient
6.
Meiosis has all of the following features EXCEPT:
Homologous chromosomes separate in anaphase I
It produces four haploid cells
Crossing over occurs between non-sister chromatids
It produces two cells genetically identical to the parent cell
7.
Which step comes first in the sequence covered in this lesson?
Which step comes first in the sequence covered in this lesson?
50% daughters carriers
Carrier mother XᴴXʰ
50% sons affected
× normal father XᴴY
8.
According to the comparison table in this lesson, what is the Note of Polygenic?
According to the comparison table in this lesson, what is the Note of Polygenic?
Non-Mendelian patterns
Pink heterozygote
Plus environment
Iᴬ and Iᴮ codominant
Males more affected
9.
According to the comparison table in this lesson, what is the Example of Multiple alleles?
According to the comparison table in this lesson, what is the Example of Multiple alleles?
Non-Mendelian patterns
Snapdragon flower colour
Height
AB blood group, roan cattle
ABO blood
10.
Which statement best describes Pleiotropy?
Which statement best describes Pleiotropy?
Both alleles fully expressed (AB blood).
Trait controlled by many genes (height, skin colour).
More than two alleles for a gene (ABO).
One gene affects many traits.
11.
Complete the statement: AB blood group is an example of ______.
Complete the statement: AB blood group is an example of ______.
codominance
polygenic
Multiple alleles
Incomplete dominance
12.
Meiosis produces genetic variation.
True
False
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Part of 7. Genetics, Populations, Evolution and Ecosystems (A Level only) — see every lesson and quiz in this unit.
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