Genetic
Barley
Information for
students:
Genetic
Barley is a type of barley that will germinate and produce either white or green
leaves, depending upon its genes.
This assessment task is made up
of 4 sections: Practical, Research, Process and Application. It is all based on
the theme of growing genetic Barley for about 2 weeks and interpreting the
observations that you make from your results.
The Application section - which
will be an “in class” written task – will be done on the 21st
March. You must bring your work for the Practical, Research and Process sections
with you on this day and you may use any of it to assist you. All sections will
be collected in class on this date.
All
work must be presented on A4 paper with each section clearly labelled, done in
your own HANDWRITING, named and stapled together or put in a plastic sleeve.
Weight:
15%
Date set:
26th
February
Due Date:
21st
March
Late
submission of work:
If
you have a valid reason and an extension is needed, please speak to your teacher
as early as possible. Work well ahead of schedule so that you can seek help if
you need it. Late work attracts a penalty of 10% per day.
SECTION 1: PRACTICAL
[10 marks]
- Place cotton wool in the
bottom of a petri dish
- Distribute the Barley
seeds evenly through the cotton wool
- Wet down the cotton wool
with water - do not saturate, but ensure wool is damp to the touch.
- Place tray in indirect
sunlight. In cold weather, try to keep plants indoors and in a warm
environment.
- Maintain moisture in tray
and check daily.
- Not all seeds will
germinate – this is normal. Be sure to count how many seeds were present
and how many germinated.
Record
your observations over 2 weeks. Keep notes based on numerical data and
general observations.
Present
a brief (approximately 2 pages) scientific report on your experiment. Guidelines
on how to write your report can be found at:
http://geocities.datacellar.net/vanstriens/pracwt.htm
Be
particularly attentive to the way you present your results section, as this will
be awarded a significant number of marks.
SECTION 2: RESEARCH
[10 marks]
You may use a variety of resources – text
books, CD ROMS, the Internet, Reference books, etc; but be sure to accurately
acknowledge your resources. Try to limit yourself to 2 pages with clear headings
for each question.
Evolution
is made possible by the presence of variation between organisms.
1.
(a)
Define evolution.
(b)
What is variation?
(c)
How can variation in a
population arise?
The
genetic barley you will germinate is predisposed to a particular condition known
as ALBINISM.
2.
(a)
What is albinism?
(b)
What is its effect on humans?
(c)
How does it affect plants?
(d)
How is albinism passed on through generations?
SECTION 3: PROCESS QUESTIONS
[5 marks]
The seeds you have germinated all
came from a cross between the same 2 parents. Even though these parents were
both green in colour, and were known to have the same genotype as each other,
there was variation in the phenotype of the offspring.
From this
information, or from your own observations in the Practical Section, answer the
following questions. Provide a key to all symbols used, and show all working.
(1)
State the probable GENOTYPES of the parents for leaf colour.
(2)
Show a genetic cross to indicate the effects on the offspring.
(3)
If the offspring were back-crossed to one of the parents in the following
combinations, what would you expect to see in this new generation’s
PHENOTYPES?
(a)
white offspring x green parent
(b)
green offspring x green parent
(Note: if more than one possibility can exist, include ALL cases)
SECTION
4: APPLICATION QUESTIONS
[10 marks]
This
will be done in class time on FRIDAY 21st MARCH. [Day 7, period 5] Bring your
answers to all other sections of work with you.
HOME
Email me at: svs@radford.act.edu.au to post questions
S. van Strien