Biology 9 Lesson 30: Genetics with humans
1. Theoretical Summary
1.1. Medical genetics counseling
Medical genetics counseling is a field of genetics that combines modern diagnostic and laboratory methods with genealogical research.
Medical genetics counseling has the function of diagnosing, providing information and giving advice related to inherited diseases and disorders.
1.2. Genetics with marriage and family planning
a. Genetics with marriage
Genetics has explained the scientific basis of the provisions in the law of marriage and family.
People who are related by blood within 3 generations must not marry each other because the recessive, harmful genes will be expressed in a homozygous state.
Monogamous marriage to balance the ratio of men and women.
Do not diagnose the sex of the fetus to ensure a balance between men and women according to age.
b. Genetics and family planning
It is reasonable for women to give birth at the age of 25 – 34 years old because at this time the body is physically perfect and the reproductive mechanism is stable, avoiding disorders that cause genetic diseases.
Each couple should only have 1 – 2 children, the interval between births is 3 – 5 years.
1.3. Genetic consequences of environmental pollution
Physical and chemical agents present in nature or man-made that increase environmental pollution, especially radioactive substances, toxic chemicals sprayed in war, pesticides, herbicides used Excessively causing genetic mutations, chromosome mutations, increasing the rate of people with genetic diseases.
2. Illustrated exercise
Fill in the blanks with suitable words in the following sentences:
“Genetics have shown that the consequences of close marriage cause harmful mutations to be expressed in homozygotes”.
“Genetics has shown that the consequences of close marriage cause mutations Dive, harmful is expressed in homozygous organisms”.
3.1. Essay exercises
Question 1: What are the functions of genetic counseling?
Verse 2: The regulation: men can only marry one wife, women can only marry one husband, people who are related by blood within four generations cannot marry each other based on what scientific basis?
Question 3: Why shouldn’t women have children over the age of 35? Why is it necessary to fight against environmental pollution?
3.2. Multiple choice exercises
Question 1: According to our country’s marriage and family law, men and women are forbidden to get married within the scope of:
A. 2 generations
B. 3 generations
C. 4 generations
D. 5 generations
Verse 2: Why shouldn’t you get married at the age of 35?
A. Women over the age of 35 who give birth to children are prone to genetic diseases
B. When the child grows up, the parents are old and not strong enough to give the child good development conditions
C. Women of this age have low fertility
D. The Law on Marriage and Family does not allow children at this age
Question 3: Which of the following statements is not true regarding the function of genetic counseling?
B. Give advice regarding genetic diseases and illnesses
C. Provide information
D. Treatment of genetic diseases and diseases
Question 4: The main causes of environmental pollution, increasing the rate of people suffering from genetic diseases and diseases are:
A. Smoke discharged from industrial zones
B. Man-made destruction of protection forests
C. Radioactive substances and chemicals that are naturally occurring or man-made
D. The source of the spread of diseases
After completing this lesson, you should:
- Understand what counseling genetics is and what the field is all about.
- Explain the genetic basis of “Monogamous marriage” and those who are related within 3 generations must not marry each other.
- Understanding why women shouldn’t have children beyond the age of 35 and the genetic consequences of environmental pollution