6.1 Human Inheritance 6.2 Human Genetic Disorders 6.3 Advances in Genetics Table of Contents Chapter Preview 1.1 Thinking Like a Scientist 1.2 The Study.

6.1 Human Inheritance

6.2 Human Genetic Disorders

6.3 Advances in Genetics

Table of ContentsChapter Preview

1.1 Thinking Like a Scientist

1.2 The Study of Life

1.3 Scientific Inquiry

1.4 Safety in the Laboratory

Chapter Preview

6.1 Human Inheritance

6.2 Human Genetic Disorders

6.3 Advances in Genetics

Chapter Preview Questions

1. From each parent, offspring inherit

a. half their phenotypes.

b. half their traits.

c. half their genes.

d. half their chromosomes.

Chapter Preview Questions

1. From each parent, offspring inherit

a. half their phenotypes.

b. half their traits.

c. half their genes.

d. half their chromosomes.

Chapter Preview Questions

2. Plant and animal cells typically have

a. three copies of every gene.

b. two copies of every gene.

c. varying copies of every gene.

d. one copy of every gene.

Chapter Preview Questions

2. Plant and animal cells typically have

a. three copies of every gene.

b. two copies of every gene.

c. varying copies of every gene.

d. one copy of every gene.

Chapter Preview Questions

3. The genetic material of living organisms is

a. cytoplasm.

b. mitochondria.

c. chromosomes.

d. DNA.

Chapter Preview Questions

3. The genetic material of living organisms is

a. cytoplasm.

b. mitochondria.

c. chromosomes.

d. DNA.

Chapter Preview Questions

4. The chromosomes of each cell in an organism are where

a. DNA is located.

b. sexual reproduction occurs.

c. gender identity is determined.

d. photosynthesis takes place.

Chapter Preview Questions

4. The chromosomes of each cell in an organism are where

a. DNA is located.

b. sexual reproduction occurs.

c. gender identity is determined.

d. photosynthesis takes place.

Suppose you have a friend who

doesn’t have freckles. Both of her

biological parents have freckles.

The allele for freckles is dominant.

What can you infer about the

genotype of your friend’s parents?

Explain your answer.

How are traits inherited in people?

High-Use Academic Words

Word Definition Example Sentence

normal adj. Usual, typical,expected

Its normal to feel nervous about going to a new school.

High-Use Academic Words

Word Definition Example Sentence

structuren. The way in which parts of something are connected

You have learned the basicstructure of plant and animal cells.

High-Use Academic Words

Word Definition Example Sentence

affectv. To influence; toproduce a change in

Scientists are looking for ways to treat diseases that affect people.

High-Use Academic Words

Word Definition Example Sentence

techniquen. A special way ofdoing something, amethod, a procedure

There are special techniques for balancing on a skateboard.

Apply It!

Choose the word that best completes each sentence.

1. People’s diets can their health.

affect

2. Doctors have developed a new for doing heart surgery.

technique

3. A(n) body temperature in a human is about 37°C.

normal

Section 1: Human Inheritance

What are some patterns of inheritance in humans?

What are the functions of the sex chromosomes?

What is the relationship between genes and the environment?

CH 6.1 HUMAN GENETICS

SINGLE GENES: SOME TRAITS ARE CONTROLLED BY A SINGLE GENE WITH TWO ALLELES (WIDOWS PEAK, FREE OR ATTACHED EAR LOBES, DIMPLES, and CLEFT CHIN).

MULTIPLE ALLELES:

SOME TRAITS CAN BE CONTROLLED BY A SINGLE GENE WITH MORE THAN TWO ALLELES. A PERSON WILL ONLY HAVE TWO ALLELES BECAUSE CHROMOSOMES OCCUR IN PAIRS.

BLOOD TYPES

BLOOD TYPE COMBINATION OF ALLELES

A AA OR AO

B BB OR BO

AB AB

O OO

Inheritance of Blood Type

Blood type is determined by a single gene with three alleles. This chart shows which combinations of alleles result in each blood type.

SEX LINKED GENES:

SEX LINKED GENES: GENES ON THE X AND Y

CHROMOSOME (23rd PAIR) ARE SEX LINKED.

RED-GREEN COLORBLINDNESS

HEMOPHILIA

BALDNESS

Red-green colorblindness is a sex-linked trait. A girl who receives only one recessive allele (written Xc) for red-green colorblindness will not have the trait. However, a boy who receives one recessive allele will be colorblind.

The Sex Chromosomes

The sex chromosomes carry genes that determine whether a person is male or female. They also carry genes that determine other traits.

Colorblindness Punnett Square

Red-green colorblindness is a sex-linked trait. A girl who receives only one recessive allele (written Xc) for red-green colorblindness will not have the trait. However, a boy who receives one recessive allele will be colorblind.

Section 2: Human Genetic Disorders

What are two major causes of genetic disorders in humans?

How do geneticists trace the inheritance of traits?

How are genetic disorder diagnosed and treated?

A Pedigree

A pedigree is a chart or “family tree” that tracks which members of a family have a particular trait.

Genetic Disorders

SOME COMMON GENETIC DISORDERS ARE:

DOWNS SYNDROME (EXTRA 21st CHROMOSOME).

HEMOPHILIA (MISSING BLOOD CLOTTING PROTIEN).

CYSTIC FIBROSIS (MUCUS FILLED LUNGS).

SICKLE CELL ANEMIA (ABNORMAL HEMOGLOBIN).

HUNTINGTONS DISEASE

TOURETTS SYNDROME

TURNERS SYNDROME

http://www.youtube.com/watch?v=aowhL33lTDs

TRISOMY 18

http://www.youtube.com/watch?v=kCe5zCrgFcU

A Hemophilia Pedigree

The pedigree shows the inheritance of hemophilia, a sex-linked disorder in a family.

Section 3: Advances in Genetics

What are three ways of producing organisms with desired traits?

What are two applications of DNA technology in human genetics?

7. WAYS TO DIAGNOSE GENETIC PROBLEMS: 

GENETIC COUNSELING

AMNIOCENTESIS

KARYOTYPING

AMNIOCENTESIS &KARYOTYPING

Changing Rice Production

The graph shows how worldwide rice production changed between 1965 and 2000. New, hybrid varieties of rice plants are one factor that has affected the amount of rice produced.

Changing Rice Production

Rice production increased.

Reading Graphs:

According to the graph, how did rice production change between 1965 and 2000?

Changing Rice Production

2 in 1965; 4 in 2000

Reading Graphs:

How many metric tons of rice per hectare were produced in 1965? How many were produced in 2000?

Changing Rice Production

2 metric tons/hectare

Calculating:

Calculate the approximate difference between rice production in 1965 and 2000.

Changing Rice Production

Possible answer: fertilizers and improved harvesting methods

Developing Hypotheses:

What factors besides new varieties of plants might help account for the difference in rice production between 1965 and 2000?

6.3 Genetic Engineering

Scientists use genetic engineering to create bacterial cells that produce important human proteins such as insulin.