Science 30 January 2000 Diploma Examination

January 2000 LA 1 - Sample Answer
a. I would cross the untreated males with resistant females. The offspring would be treated with the
pesticide to see how many are resistant. The following cross would occur if the untreated moths were
heterozygous and the resistant moths were homozygous recessive.
About half of the offspring would be resistant.
b. An insecticide should not kill organisms it is not intended to kill. Beneficial insects and birds should be
protected. This will minimize the damage to the ecosystem.
The insecticide should break down quickly in the environment so that it does not accumulate in the
tissue of other animals.
Also the insecticide should not move easily to areas away from where it is being used. This will protect
other organisms from its effects.
The insecticide should not be toxic to humans and it would also be desirable that it be inexpensive and
easy to apply.
January 2000 LA 1 - Scoring Guide
SCORE
4
Standard of
Excellence
3
2
Acceptable
Standard
1
0
NR
SCORING DESCRIPTIONS
The response is complete, well organized, and reflects thorough understanding and
logical consistency of thought. The description of the experiment is logical and
realistic. The expected results closely match the design of the experiment. Two or
three desirable characteristics of an insecticide are accurately and completely
described.
The response is mostly complete, organized, and reflects correct understanding.
The description of the experiment is logical. The expected results mostly match the
design of the experiment. Two or three desirable characteristics of an insecticide are
accurately described.
The response is organized, and is generally logical and consistent. The description of
the experiment is adequate. The expected results generally match the design of the
experiment. One or two desirable characteristics of an insecticide are described.
The response is incomplete, disorganized, and reflects poor understanding. The
description of the experiment is not adequate. The expected results don't match the
design of the experiment. Desirable characteristics of an insecticide are lacking.
The response does not address any of the major points of the question at an appropriate
level for a 30-level course.
No response.
02/08/00