the natural home environment of an animal, plant, or other organism.having live young that developed inside the body of the parent.

an organism that decomposes organic material.

the process of maintaining salt and water balance.

Occurs when the contribution of both alleles are visible in phenotype.

is the reappearance of an ancestral characteristics after it has apparently not come to light for few generation.

is a type of cell division that forms four haploid cells.Inheritance refers to two or more genes that have influence on the phenotype of an organisms.is the study of heredity or how characteristics are passed from parents to offspring.is the ability of one parent to pass its genetic characteristics onto their offspring.are thread-like structure that are made up of a long molecule of DNA.is a section of DNA that contains the information for a particular genetic characteristics.is the pattern of inheritance in individuals that have two different alleles for a certain gene, one allele is dominant and the other is recessive.Genetic make up of an organismPhenotype - Physical appearance of an organism.number of chromosomes in the cell (46n).allele that is masked by the presence of a dominant allele and can only appear phenotypically if homozygous.Inheritance that produce a heterozygote with a phenotype that is intermediate or in between the phenotypes of the homozygote parent.This process is called natural selection, and it is the main force that drives evolution. As a result, the tree-colored moths are more likely to survive, reproduce, and pass on their genes. Moths with wings similar to the color of tree bark are better able to camouflage themselves than moths of a different color. An example would be moths of the same species with different color wings. Organisms of even a small population can differ strikingly in terms of how well suited they are for life in a certain environment. Genetic variation in a group of organisms enables some organisms to survive better than others in the environment in which they live. Finally, genetic variation can be a result of sexual reproduction, which leads to the creation of new combinations of genes. Another source is gene flow, or the movement of genes between different groups of organisms.

Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation. Genetic variation within a species can result from a few different sources. The genotype that an individual possesses for a trait, in turn, determines the phenotype-the observable characteristics-such as whether that individual actually ends up with straight, wavy, or curly hair. The combination of alleles of a gene that an individual receives from both parents determines what biologists call the genotype for a particular trait, such as hair texture. Additionally, genes can exist in slightly different forms, called alleles, which further adds to genetic variation.

Most organisms that reproduce sexually have two copies of each gene, because each parent cell or organism donates a single copy of its genes to its offspring. The genes that are encoded within these proteins are what enable cells to function. Genes are units of hereditary information, and they carry instructions for building proteins. For instance, the human genome contains somewhere between twenty and twenty-five thousand genes. A genome is all the hereditary information-all the genes-of an organism. Genetic variation refers to differences among the genomes of members of the same species.

Genetic sequences crossword