Genes that are located near each other on a chromosome are called linked genes. They are linked because they travel together during meiosis. This means they get packaged into the same gamete more often than not. The exception to this rule is when recombination occurs and genes are swapped. Re...
Definition: The fundamental, physical, and functional unit of heredity Table of Contents A gene is the fundamental, physical, and functional unit of heredity. The genes make up the sequences of DNA (genotypes). The genotypes, together with the other factors (e.g. environmental factors), dete...
Genetic inheritance is the process by which genes are passed down from parents to their offspring. Two types of genetic inheritance discussed in this lesson are sex-linked inheritance and polygenic inheritance. Sex-linked inheritance occurs when a trait is linked to one of the sex chromosomes. Tra...
Genes on the X and Y sex chromosomes are sex-linked. Females have two copies of the X chromosome and thus have two alleles for each gene on the X. Males have an X and Y, which means they have a number of single-copy genes and are the only ones to inherit Y-linked traits. The c...
Sex chromosome, either of a pair of chromosomes that determine whether an individual is male or female. The sex chromosomes of human beings and other mammals are designated by scientists as X and Y. In humans the sex chromosomes consist of one pair of th
Sex-Linked Inheritance is the inheritance of a trait (phenotype) that is determined by a gene located on one of the sex chromosomes. The genes which occur exclusively on the X chromosome or on the analogous Z chromosome (in birds and other species) are called X- or Z -linked genes while...
X linkage is the state of a genetic factor (gene) being borne on theX chromosome. The inheritance of these genes from theX chromosomeis referred to asX-linked inheritance, and may either be recessive or dominant. For instance, a female offspring whose father has an X-linkeddominanttrait woul...
Gram-positive bacterium, any of various types of bacteria that are characterized by having a thick peptidoglycan cell wall and by the absence of an outer membrane composed of lipopolysaccharide. Gram-positive bacteria are named because of their reaction
In the past few years, several genes have been linked to cell death in lymphoid cells. However, only a handful of these genes has been shown to be required for cell death to occur in the immune system. This review focuses on signals known to mediate apoptosis in the immune system and ...
Even though the law of independent assortment has been used as a mechanism to explain various genetic processes, there are some limitations associated with the law. Some of those limitations are listed below; The law of independent assortment doesn’t hold true for linked genes present on the sa...