Genetics - exam style questions

hollandmercifulΒιοτεχνολογία

11 Δεκ 2012 (πριν από 4 χρόνια και 11 μήνες)

442 εμφανίσεις


AQA Science © Nelson Thornes Ltd 2006

B1b 6
1

B1b 6

Exam
-
style questions

Name:

Class:

Variation

1

Young plants and animals resemble their parents. This is because characteristics are inherited by
the young from their parents.


Match words
A
,
B
,
C

and
D

with the spaces
1

to
4

in the sentences.


A

Chromosomes ....................

B

DNA ......
..............


C

Gametes ....................

D

Genes ....................


Genetic information is passed from parents to offspring in sex cells called …
1
… The sex cells
contain thread
-
like structures known as …
2
… .


The thread
-
like structures contain tho
usands of …
3
…. that are the units of inheritance.


These units of inheritance are small sections of a double helix called …
4
… .

(4)

2

The table is about the production of offspring.


Match words
A
,
B
,
C

and
D

with the processes
1

to
4

in the table.


A

Sexu
al reproduction ……….

B

Asexual reproduction ……….


C

Inheritance ……….

D

Cloning ……….


Process

1

Joining of male and female sex cells (gametes) to produce
young

2

Making young that are identical to both their parents and to
each other, especially in agricu
lture

3

Producing offspring without sex cells (gametes)

4

Passing on characteristics from parents to offspring







(4)

3

Plant tissue culture is a method used to create new plants. One method is described below:




A small piece of tissue is removed f
rom a plant.




Under sterile conditions, the tissue is placed in a vessel containing nutrients.




A mass of identical plant cells develops.




These cells are placed in a medium containing nutrients and plant growth regulators
(hormones).




Young plants

develop that are separated and grown to maturity.


AQA Science © Nelson Thornes Ltd 2006

B1b 6
2

B1b 6

Exam
-
style questions

Continued …


(a)

What type of reproduction is involved in plant tissue culture?




................................
................................
................................
................................
..........


(1)


(b)

Why is a disease more likely to kill every one of a group of plants produced by tissue culture
than a group grown from seeds
?




................................
................................
................................
................................
..........





................................
................................
................................
................................
..........


(2)


(c)

Suggest one advantage of growing plants from tissue culture over growing them from
cuttings or seeds.




................................
................................
................................
................................
..........


(1)

4

Some humans suffer from diabetes. One form of diabetes is caused by the inability to make the
hormone insulin. Diabetics can
lead normal lives providing they can inject insulin into their
bloodstream at regular intervals. The diagram shows how insulin can be made using genetic
engineering.




(a)

Using only the information in the diagram

suggest what the following enzymes do:



(i)

lysozyme enzyme




................................
................................
................................
................................
..........


(1)



(ii)

restriction enzyme




................................
................................
................................
................................
..........


(1)


AQA Science © Nelson Thornes Ltd 2006

B1b 6
3

B1b 6

Exam
-
style questions

Continued …


(b)

Using only the information in the diagram
, describe how the human insulin gene is
transferred into a bacterium which then makes insulin.




................................
................................
................................
................................
..........





................................
................................
................................
................................
..........





................................
................................
................................
................................
..........





................................
................................
................................
................................
..........





................................
................................
................................
................................
..........





................................
................................
................................
................................
..........


(6)


(c)

Insulin is produce
d from cloned bacteria that contain the human insulin gene.



(i)

What is a clone?





................................
................................
................................
................................
....


(1)



(ii)

Do you think that cloning is the result of sexual or asexual reproduction? Explain your
answer.





................................
................................
................................
................................
....


(1)



(iii)

A bacterium can divide every 20 minutes. Sta
rting with 50 bacteria, how many bacteria
would there be after 2 hours? Show your working.





................................
................................
................................
................................
....






................................
................................
................................
................................
....






................................
................................
................................
................................
....


(1)


(d)

Insulin to treat diabetes used to be extracted from the pancreases of pigs and cattle. Give
two advantages of insulin produced by genetic eng
ineering over extracting it from animals.




................................
................................
................................
................................
..........





................................
................................
................................
................................
..........





................................
................................
................................
................................
..........





................................
................................
................................
................................
..........


(2)