What causes the most common chromosomal abnormality called trisomy 21?

What causes the most common chromosomal abnormality called trisomy 21?

Also known as Down syndrome, trisomy 21 is a genetic condition caused by an extra chromosome. Most babies inherit 23 chromosomes from each parent, for a total of 46 chromosomes. Babies with Down syndrome however, end up with three chromosomes at position 21, instead of the usual pair.

What happens with gametes to create chromosomal abnormalities?

When a sperm fertilizes an egg, the union leads to a baby with 46 chromosomes. But if meiosis doesn’t happen normally, a baby may have an extra chromosome (trisomy), or have a missing chromosome (monosomy). These problems can cause pregnancy loss.

What is the defining feature of chromosomes quizlet?

What is the defining feature of chromosomes? They contain genetic information from each parent.

What is the defining feature of chromosomes?

Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA). Passed from parents to offspring, DNA contains the specific instructions that make each type of living creature unique.

What is the primary function of chromosome?

Chromosomes are essential for the process of cell division, replication, division, and creation of daughter cells. Chromosomes are often called the ‘packaging material’ because it tightly holds the DNA and proteins together in the eukaryotic cells.

What is an example of gene-environment interaction?

Not only do our genes and environment interact, as in range of reaction, but they also influence one another bidirectionally. For example, the child of an NBA player would probably be exposed to basketball from an early age. Such exposure might allow the child to realize his or her full genetic, athletic potential.

What do you mean by gene interaction?

In genetics, gene-gene interaction (epistasis) is the effect of one gene on a disease modified by another gene or several other genes. Epistasis can be contrasted with dominance, which is an interaction between alleles at the same gene locus.