genetic disorder

What are the four different types of genetic disorders?

Single-gene, Multifactorial, Chromosomal, Mitochondrial.

What is a genetic disorder?

A disease caused by abnormalities in an individual’s genetic material.

What is a single-gene disorder?

Disorders caused by changes or mutations that occur in the DNA sequence of one gene.

What role do genes play in the body?

Genes contain instructions for the production of proteins.

What happens when a gene is mutated?

It can result in a protein product that can no longer carry out its normal job.

What is the genotype of parents who are carriers for sickle cell disease?

Ss (heterozygous for the condition).

What is the risk of two carriers for sickle cell disease having an affected child?

There is a 25% chance that the child will have sickle cell disease.

What are multifactorial disorders?

Disorders caused by a combination of environmental factors and mutations in multiple genes.

How is heart disease associated with genetics?

Development of heart disease is associated with multiple genes, lifestyle, and environmental factors.

Where have genes that influence breast cancer development been found?

On chromosomes 6, 11, 13, 14, 15, 17 & 22.

How many chromosomes do humans have in their body cells?

46 chromosomes.

What are autosomes?

44 chromosomes that are not sex chromosomes.

What is the significance of karyotypes?

Karyotypes are important in diagnosing chromosomal disorders.

What do mitochondria do in cells?

Mitochondria convert energy and contain DNA.

What is a mitochondrial disorder?

A genetic disorder caused by mutations in nonchromosomal DNA of mitochondria.

How is mitochondrial DNA inherited?

It is passed solely from mother to child.

What is carrier screening?

A test to determine whether an individual carries a copy of an altered gene for a particular recessive disease.

When is carrier screening often used?

If a disease is common in a couple’s ethnic background or if there is a family history of the disease.

What are examples of diseases that can be tested for in carrier screening?

Tay-Sachs disease and sickle cell disease.

What is Preimplantation Genetic Diagnosis (PGD)?

A process used following in vitro fertilization to diagnose a genetic disease before the embryo is implanted.

What does prenatal diagnosis allow parents to do?

Diagnose a genetic condition in their developing fetus.

What techniques are used in prenatal diagnosis?

Amniocentesis, chorionic villi sampling (CVS), and scheduled ultrasound.

What is the goal of newborn screening?

To identify affected newborns quickly to provide prompt treatment and care.

How many genetic or metabolic disorders can state tests for newborns screen for?

Anywhere from 4 to over 30.

What is the role of a genetic counselor?

To explain diseases or disorders and outline options for genetic testing and management.

How is newborn screening executed?

Using tests mandated by the state that vary from state to state.

What factors complicate the development of multifactorial disorders?

Multiple genetic mutations and environmental influences.

What happens if chromosomes have missing or extra copies or breaks?

Problems arise that can lead to genetic disorders.

What does a gene encode for?

Instructions for the production of proteins.

What is one consequence of genetic mutations?

A protein may not function properly, leading to diseases.

What genetic disorder is associated with a 25% risk of being passed to a child?

Sickle cell disease.

What defines a multifactorial genetic disorder?

Caused by genetic and environmental factors affecting multiple genes.

How is mitochondrial DNA different from nuclear DNA?

It is inherited only from the mother.

What is the purpose of carrier testing?

To identify individuals who carry a mutation for a recessive disorder.

How does PGD help in selecting embryos?

By diagnosing genetic conditions before implantation.

What helps determine the risk associated with recessive genetic disorders?

Understanding carrier status of parents.

What is meant by recessive trait in genetics?

A trait that requires two copies of a mutated gene for the disease to manifest.

What role do environmental factors play in disease development?

They contribute to the risk along with genetic predispositions.

What is an example of a diagnostic test for expecting parents?

Amniocentesis.

What is the significance of autosomes compared to sex chromosomes?

Autosomes are chromosomes that are not involved in determining sex.

What is a key function of proteins in the human body?

They carry out various biological functions essential for life.

What do we call genetic information viewed under a microscope?

Karyotype.

What are the implications of being a carrier for a genetic condition?

The individual does not show the trait but can pass it on to offspring.

What is a common type of screening done for newborns?

Newborn screening for genetic and metabolic disorders.

What is significant about the timeline of diseases identified through newborn screening?

It allows for early diagnosis and immediate treatment.

What role do genetic counselors play in healthcare today?

They assist families with testing options and consequences of genetic disorders.

What environmental factors can influence genetic disorders?

Lifestyle, diet, exposure to toxins, and stress.

What significance do lifestyle choices have on genetic predispositions?

They can exacerbate or help mitigate the effects of genetic risks.

How is gene mutation related to the function of proteins?

Mutations can result in nonfunctional proteins that lead to disease.

What are chronic illnesses often associated with?

Multifactorial causes, involving both genetic and environmental factors.

What is an autosomal recessive condition?

A condition that occurs when two copies of a mutated gene are present.

What is the primary purpose of karyotyping?

To identify chromosomal abnormalities.

What makes mitochondrial DNA unique?

It is inherited maternally and has a different mutation rate.

How does PGD impact reproductive choices?

It allows for selection of embryos free of certain genetic conditions.

What technology is commonly used in genetic screening?

Techniques such as amniocentesis and CVS.

Why might ethnic background influence the decision for carrier screening?

Certain genes may be more prevalent in specific populations.

What is considered the most widespread type of genetic screening?

Newborn screening.

What does the genetic condition monitoring during pregnancy enable parents to do?

Make informed choices regarding the health of their fetus.

Why is genetic screening vital for public health?

It allows for early intervention and management of genetic disorders.

What are some common genetic conditions tested in newborns?

Conditions like phenylketonuria (PKU) and cystic fibrosis.

What does the successful screening at birth aim to provide?

Quick identification for treatment to prevent complications.

What critical role do carrier screenings serve in family planning?

They inform potential parents about risks of genetic disorders in offspring.

What is the educational focus of genetic counseling sessions?

To explain risks associated with genetic conditions and available testing options.

How does knowledge of genetic predispositions affect healthcare decisions?

It shapes preventative strategies, screening, and treatment approaches.

Why do newer genetic screening techniques emerge continuously?

To improve accuracy, reduce risks, and personalize medicine.

How do chromosomal abnormalities arise?

Through errors during cell division leading to extra, missing, or altered chromosomes.

Why do some genetic disorders require specific ethnic group screening?

Certain conditions are linked to higher frequencies in specific populations.

What are the psychological challenges faced by families with genetic disorders?

Anxiety, uncertainty, and emotional stress related to disease management.

What is the role of ultrasound during pregnancy in genetic monitoring?

To visualize fetal development and identify potential anomalies.

How does understanding genetic disorders impact future generations?

It informs medical history and risk assessments for offspring.