How is Down syndrome caused?

Q: How can epistasis explain incomplete penetrance?

A: Penetrance in genetic terms refers to the ratio of individuals that carry a specific allele of a…

Q: What is Extrachromosomal inheritance?

A: Inheritance is the process by which this genetic information present in the genes is passed on from…

Q: What is Biparental inheritance?

A: Genes carry coded genetic information in the form of specific nucleotide sequences. This specific…

Q: What is crossing over, when does it occur, and what is its significance

A: Genes located close together on the same chromosome are transmitted as a single unit to the daughter…

Q: Do we know what genes cause Down syndrome?

A: In simple words, Gene can be defined as the basic physical and functional unit of heredity. Genes…

Q: What is incomplete dominance?

A: The genetics is the branch of biology that deals with the study of genes, genetic variation and…

Q: What are the inheritable patterns of a dominant and recessive lethal allele? Is Huntington Disease…

A: A large proportion of genes in an individual's genome are very important for survival for life.

Q: What is nondisjunction and the diseases?

A: Nondisjunction is a chromosomal disorder.

Q: How can you explain that not all Down syndrome cases are due to nondisjunction?

A: The syndrome can be analyzed as per the clinical signs and side effects that are associated with one…

Q: How is prenatal diagnosis of Down syndrome achieved?

A: Genetic disorders result from chromosomal abnormalities like Down syndrome and Turner syndrome. A…

Q: does Turner syndrome more common in males or females?

A: Set of certain symptoms related to underlying genetic characteristics of an organism resulting in a…

Q: What occurs during crossing over?

A: Cell division is a process by which a cell divides into two or more daughter cells. cell division…

Q: Is heterozygous dangerous?

A: An observable characteristic of an organism is called its phenotype, while the actual pair of…

Q: What are the effects of aneuploidy?

A: Aneuploidy refers to losses or gains of individual chromosomes from the normal set of chromosomes.…

Q: What are the 3 types of Down syndrome?

A: Down syndrome is a kind of genetic disorder that results in developmental delays, intellectual…

Q: What is Down's syndrome? Give its symptoms and cause. Why is it that the chances of having a child…

A: Human genetic disorders are caused by the absence, excess, or abnormal arrangement of one or more…

Q: What is an example of Extrachromosomal inheritance?

A: Inheritance is the process by which this genetic information present in the genes is passed on from…

Q: What is Codominance inheritance?

A: The genetics is the branch of biology that deals with the study of genes, genetic variation and…

Q: Are all froms of Down Syndrome due to non-disjunction?  Explain

A: There are three forms of Down's Syndrome- 1. Trisomy 21 2. Non-disjunction 3. Mosaicism

Q: What is polyembryony?

A: An embryo is defined as the early developmental stage of eukaryotic organisms following the…

Q: What is pleiotropy?

A: Pleiotropy refers to the expression of multiple traits by a single gene. These expressed traits may…

Q: How to reduce chromosomal abnormalities?

A: Chromosomal abnormalities can be structural or numerical. A structural chromosomal abnormality means…

Q: What are chromosomal disorders?

A: The chromosomes are thread-like structure situated inside the nucleus of plant and animal cells.…

Q: What is a down syndrome?

A: Humans are diploid organisms,i.e., humans will have two copies for each chromosome in the cells. One…

Q: Why the allele for Huntington disease is dominant?

A: Step 1 Huntington disease is an inherited disorder that causes the death of brain cells by the…

Q: Explain the concept of mendal's law of inheritence?

A: Gregor Mendel conducted experiments on pea plant (Pisum sativum) demonstrating the inheritance of…

Q: What is an individual with a heterozygous genotype?

A: The genotype is a collection of genes and controls the genetic features of an organism.

Q: What is the most common chromosomal disorder?

A:

Q: What is a monogenic disease?

A: A monogenic disease is a disease that results from a flaw is a single gene that is the direct cause…

Q: What causes Extrachromosomal inheritance?

A: Inheritance or heredity is passing-on one trait form the parents to the progeny by either asexual or…

Q: What is the cause of Down syndrome?

A: A mutation denotes the manipulation of sequence of the genetic material of a living organism that is…

Q: What is the difference between primary Down syndrome and familial Down syndrome? How does each type…

A: Trisomy is the addition of a single chromosome in the whole set of chromosome. Addition of single…

Q: How is it that genetic abnormalities that include an extra Y chromosome do not have a severe…

A: Genetically all human males normally have a XY chromosome whereas the females have a XX pair. They…

Q: What is Codominance and incomplete dominance?

A: A character is represented by an organism by at least two alleles. They lie on the two homologous…

Q: Give some examples for down syndrome

A: Genes are housed in chromosomes, which are structures. Numerical or structural chromosomal…

Q: What are affects when Nondisjunction occurs?

A: The separation of the sister chromatids or homologous chromosomes is one of the defined steps of…

Q: Canphenotype change without a change in genotype?

A: Epigenetics: It is study of heritable changes / phenotypes which are caused due to no changes in…

Q: What characteristics are exhibited by a Y-linked trait?

A: Genetic material is any material of animal, microbial, or plants, or other origin that carries…

Q: what are  chromosomal abnormalities??

A: Deoxyribonucleic acid (DNA) is a molecule composed of two polynucleotide chains. It coils around…

Q: Which inheritance is Uniparental?

A: Inheritance is the transmission of genetic traits from parents to the progeny.

Q: what are the types of down syndrome

A: Down syndrome is a condition in which a person has an extra chromosome. people with Down syndrome…

Q: explain what is Down syndrome?

A: Genetic disorder are caused due to the absence or excess or abnormal arrangement of one or more…

Q: What are the  symptoms of chromosomal abnormalities?

A: The chromosomal abnormalities can be categorized into two types that are structural and numerical.…

Q: What does double homozygous mean?

A: The alternate form of gene is known as allele. Allele are of two types, namely dominant allele and…

Q: What are the various phenotypic changes in cri du chat syndrome ?

A: A syndrome is a medical condition in which a group of symptoms appears. These symptoms are generally…

Q: Are all forms of Down syndrome due to non-disjunction?​YES​​​ or NO​?

A: Down syndrome is a genetic disorder caused when abnormal cell division results in an extra full or…

Q: What is uniparental disomy and how does it arise?

A: DNA is the genetic material in most living organisms. It is the information hub of the cell that…

Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.