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I. You will hear a text about human genetic disorders. Before listening discuss the words in the box with your fellow students and your teacher

physical deformity

metabolic dysfunction

mental retardation

allele

to inhibit

severe disability

cystic fibrosis

salt imbalance

thick, suffocating mucus

Huntington’s disease

involuntary movements

dementia

hemophilia

clotting proteins

to have a devastating effect

fetus

to die prenatally

miscarriage

shortened life expectancy

II. Fill in the table below with the missing information

Name of the disease

Problems caused

Type of genetic disorder

cystic fibrosis

single gene disorder caused by a recessive allele

……… ………, ………, death

single gene disorder caused by a dominant allele

hemophilia

……… ………, short stature, ……… ………, shortened life expectancy

III. Listen to the text again and summarize it using the following words and expressions

inherited diseases;

altered genes;

chromosomal abnormalities;

physical defects;

metabolic dysfunction;

mental retardation;

disturbances in the body’s biochemical processes;

single-gene disorder

dominant-recessive pattern of inheritance;

X chromosome;

defective chromosomal structure.

SPEAKING

Speak about genetics covering the following issues:

a) what is genetics;

b) divisions of genetics;

c) methods and techniques used in modern genetics;

d) practical applications of genetics in medicine, agriculture, industry, etc.;

e) genetic abnormalities in humans and diseases they cause.

Lesson 4

ECOLOGY

PRE-READING TASKS

I. Answer the following questions

    • How do you understand the word ‘ecology’?

    • Why do you think the profession of ecologist has gained importance in recent years?

    • How can you characterize human influence on natural ecosystems?

II. Listen to the following words and practice their pronunciation

Abiotic, bioecology, bionomics, biotic, consumer, decomposer, ecological niche, ecosystem, energy budget, energy flow, environmental pollution, food chain, functional niche, microcalorimetry, nutrient cycling, population dynamics, primary production, producer, radioisotope, social behaviour, succession, trophic level, trophic-dynamic concept.

READING COMPREHENSION AND VOCABULARY DEVELOPMENT

I. Match each word on the left to its correct definition on the right

  1. community, v

  2. consumer, n

  3. decomposer, n

  4. distribution, n

  5. niche, n

  6. pollution, n

  7. population, n

  8. scarcity, n

  9. starvation, n

  10. supply, v

  1. deficiency in quantity or number compared with the demand;

  2. the process of making air, water, soil etc dangerously dirty, or the state of being dangerously dirty;

  3. the natural geographic range of an organism;

  4. to make available for use , provide;

  5. the ecological role of an organism in a community especially in regard to food consumption

  6. an organism requiring complex organic compounds for food which it obtains by preying on other organisms or by eating particles of organic matter;

  7. any of various organisms (as many bacteria and fungi) that return constituents of organic substances to ecological cycles by feeding on and breaking down dead protoplasm;

  8. suffering or death caused by lack of food;

  9. a group of interbreeding organisms that represents the level of organization at which speciation begins

  10. an interacting population of various kinds of individuals (as species) in a common location.