DIAGNOSIS DOWNS SYNDROME: (autosomes; trisomy 21)

Slides:

Advertisements

Similar presentations

Chromosome Disorders. Prenatal Diagnosis Amniocentesis A small sample of the amniotic fluid surrounding the baby is removed using a syringe. The fluid.

Advertisements

Changes in Chromosome Number

Genetic Disorders, Blood Typing, and Genetic Engineering.

Chapter 4, Section 2 Human Genetic Disorders

Biology Chapter 11 Human Genetics. Human Genetic Disorders  Can be recessive disorders  In some cases, can be dominant disorders  We are going to look.

Problems in Prenatal Development

Karyotype picture of the chromosomes in a cell used to check for abnormalities Prenatal diagnosis: Trisomy 21 (Down’s syndrome)

Chapter 7 PowerPoint by Jacob Rondinella.

KARYOTYPING Honors Biology. What and How? Used as a way to “see” the chromosomes Pairs up homologous chromosomes Allows for detection of several genetic.

Name Date Period Chapter 14 Human Genetics Take notes here Summary – one summary at the end Questions “Cornell Style”

Making and reading karyotypes

Karyotype- magnified images of chromosomes that are arranged in order A human karyotype.

Human Genetics and the Pedigree. Section Objectives Understand how different mutations occur. Be able to identify different diseases and disorders.

 Studying humans requires alternative methods.  Human geneticists use.  Human are – Deduce the genotypes and phenotypes of individuals in.

Genetic Disorders Things Can Go Wrong With DNA and Chromosomes.

Genetic Disorders Diseases. What is a Genetic Disorder or Disease? A genetic disorder is an abnormal condition that a person inherits through genes or.

Human Heredity. A karyotype is a picture of chromosomes Of the 46 human chromosomes, they are arranged in 23 pairs 22 of the pairs are called body chromosomes.

Generation to Generation Chromosomes: Tiny structures with in the nuclei of cells that carry information about heredity traits. ~Cells in the body contain.

4.3 Alterations In Chromosome Structure and Number

Human Genetic Disorders Notes. What causes genetic disorders? Mutations, or changes in a person’s DNA.

VII. Genetic Disorders A. Turner’s Syndrome – females w/ only 1 X chr. (XO) Nondisjunction 1 out of 3,000 infertile Short stature Webbed neck

Mutations & Diseases. Nondisjunction: Missing 1 chromosome LETHAL! Results from nondisjunction –Chromosomes do not separate properly Miscarriage.

GeneticDisorders Things Can Go Wrong With DNA and/or Chromosomes.

Honors Biology- Chapter 14. The Human Genome Project  Completed in 2003  13 year project  discovered all the estimated 20,000-25,000 human genes 

Human Heredity Chap 11 Lab Biology Mrs. Moon. Human Genetics Human chromosome # = 46 Human nucleotide pairs of DNA = 6 billion Gametes – reproductive.

Topic Non-disjunction leads to changes in chromosome number Non-disjunction = an unequal distribution of chromosomes in gametes because chromosomes.

Chromosomes and Human Heredity Chapter Karyotype Studies  Scientists do not only study genes – they also like to look at the chromosome at a whole.

Human Genome Project 13-year project completed in 2003 Project goals:

Chapter 11 Human Heredity.

Chapter 14: The Human Genome.

Generation to Generation

Karyotypes copyright cmassengale.

Modes of Inheritance Genetic Disorders: A disease or debilitating condition that has a genetic basis (carried by genes on chromosomes) Genetic Disorders.

Things Can Go Wrong With DNA and Chromosomes

Prenatal monitoring.

Antenatal Screening Rebecca Sykes.

LO: SWBAT explain the difference between chromosome mutations and gene mutations and give an example of each. DN: Quiz HW: Review Book- Biochemistry.

Mutations and Chromosomal Disorders

Chromosome Disorders.

Sex – linked Traits Genes for these traits are located only on the X chromosome (NOT on the Y chromosome) X linked alleles always show up in males whether.

Karyotypes BIO Predict offspring ratios based on a variety of inheritance patterns (including dominance, co-dominance, incomplete dominance,

James G. Anderson, Ph. D Purdue University.

Mutations Affecting Humans

Human Heredity.

Genetic Disorders.

Karyotypes BIO Predict offspring ratios based on a variety of inheritance patterns (including dominance, co-dominance, incomplete dominance, multiple.

Sex – linked Traits Genes for these traits are located only on the X chromosome (NOT on the Y chromosome) X linked alleles always show up in males whether.

Ch.7: Meiosis and Sexual Reproduction

Analyzing Human Inheritance

Human Genetics and Pedigrees Honors Biology Ms. Day

Non-Mendelian Inheritance…another pattern

Chapter 11 Section 3: Chromosomes and Human Heredity

A picture of a person’s chromosomes.

Abnormal Meiosis.

Chapter 11 Human Heredity.

Chromosome Anomalies & Genetic Diseases

Unit 6 “Complex Inheritance”

With DNA and/or Chromosomes

Nondisjunction and Karyotypes

Human Genetics – Studying Chromosomes & Diseases

Chapter 11 Genetic Disorders

Genetic Diseases & Pedigrees

Notes: When Mistakes Occur

Ch. 4.3 Notes Problems in Prenatal Development

Diagnosing Genetic Disorders

Presentation transcript:

DIAGNOSIS DOWNS SYNDROME: (autosomes; trisomy 21) Extra copy of chromo. #21 or #21 attaches to other chromo. 1:800 babies affected, range from mild to severe retardation Prenatal diagnosis Amniocentesis-Remove a small amt. Of fluid from embryonic sac, cells are grown, no cell division allowed, karyotype is done Chorionic villus biopsy- embryonic cells removed directly from the membrane surrounding the embryo; quicker but dangerous Cystic fibrosis (CF) Tay-Sachs disease (TD) ETHICAL CONSIDERATIONS: Who lives and dies??????

DIAGNOSIS