Is a segment of DNA along the length of the chromosome?

Is a segment of DNA along the length of the chromosome?

A chromosome contains many genes. A gene is a segment of DNA that provides the code to construct proteins. The DNA molecule is a long, coiled double helix that resembles a spiral staircase.

What do most chromosomal defects result from?

Abnormal chromosomes most often happen as a result of an error during cell division. Chromosome abnormalities often happen due to one or more of these: Errors during dividing of sex cells (meiosis) Errors during dividing of other cells (mitosis)

What refers to a person’s genetic makeup?

A person’s genetic makeup is called a genotype.

What is the field of study that focuses on genes and their expression?

In another approach to gene-environment interactions, the field of epigenetics looks beyond the genotype itself and studies how the same genotype can be expressed in different ways. In other words, researchers study how the same genotype can lead to very different phenotypes.

Does each chromosome have the same DNA?

Each chromosome is a single molecule of DNA. Our cells have all 46 chromosomes, but they are coiled around proteins and highly coiled into the form of the chromosomes that are seen to the right. The chromosomes of eukaryotes are contained within the membrane-bound nucleus.

What is the relationship among DNA a gene and a chromosome?

Genes are segments of deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person’s genes. Genes are contained in chromosomes, which are in the cell nucleus.

Can sperm cause chromosomal abnormalities?

Chromosomal Issues Because half of a developing baby’s chromosomes come from the father, it is possible that he may contribute abnormal chromosomes to a pregnancy. About three out of four miscarriages occur during the first trimester of pregnancy.

What are the 4 chromosomal abnormalities?

Examples of chromosomal abnormalities include Down syndrome, Trisomy 18, Trisomy 13, Klinefelter syndrome, XYY syndrome, Turner syndrome and triple X syndrome.

How genetic makeup is expressed?

The physical expression of characteristics is accomplished through the expression of genes carried on chromosomes. The genetic makeup of peas consists of two similar or homologous copies of each chromosome, one from each parent. Each pair of homologous chromosomes has the same linear order of genes.

What is alleles in psychology?

n. an alternate form of a gene that occupies a given position on each of a pair of homologous chromosomes. Each person typically has two alleles of each gene: One is inherited from the mother and the other from the father.

Which part of your brain is essential for receiving information that you are moving your legs Group of answer choices?

One of the brain areas most involved in controlling these voluntary movements is the motor cortex. The motor cortex is located in the rear portion of the frontal lobe, just before the central sulcus (furrow) that separates the frontal lobe from the parietal lobe.

Is a sensory relay station where all sensory information?

The thalamus is often described as a relay station. This is because almost all sensory information (with the exception of smell) that proceeds to the cortex first stops in the thalamus before being sent on to its destination.