Essays Tagged: "alleles"

Philisophical summary of Darwin's Theory of Evolution

be slight or substantial; it embraces everything from slight changes in the proportion of different alleles within a population (such as those determining blood types) to the successive alterations th ...

(1 pages) 82 0 4.2 Sep/2002

Subjects: Humanities Essays > Philosophy > Classical Philosophy

Evolution

drift. Genetic drift isa random change in a small gene pool due to sampling errors in propagation ofalleles or chance. Genetic drift depends greatly on the size of the gene pool. Ifthe gene pool is la ... effect on the population. Another mechanism is geneflow which is when a population may gain or lose alleles by the migration offertile individuals between populations. This may cause the allele freque ...

(3 pages) 116 0 4.0 Feb/1997

Subjects: Science Essays > Biology

Hardy-Weinberg model

genotype frequencies to change over time.When there is no migration, and gene flow, the transfer of alleles between populations due to the movement of individuals or gametes, occur, the frequency of a ... d q2), and the frequency of heterozygotes (2pq); and also the two equations, that indicate that all alleles sum to 100% (p+q=1) and that all individuals sum to 100% (p2+2pq+q2=1) Below is the work sho ...

(1 pages) 29 0 3.0 May/2004

Subjects: Science Essays > Biology

Mendel and the Deviations.

ven though there are two genes in ordinary cells. If your eyes are blue, green or grey you have two alleles for blue eyes (bb), then your gametes must have a blue allele (b); if your eyes are brown yo ...

(3 pages) 53 0 4.0 Feb/2006

Subjects: Science Essays > Genetics & Genome Projects

Famous Biologists

ven though there are two genes in ordinary cells. If your eyes are blue, green or grey you have two alleles for blue eyes (bb), then your gametes must have a blue allele (b); if your eyes are brown yo ...

(5 pages) 36 0 5.0 Feb/2006

Subjects: Science Essays > Biology

Heredity

lowing figure:Mendel's principle of independent assortment states that during gamete formation, the alleles of a gene for one trait (Tt), segregate independently from the alleles of a gene from anothe ... green seeds.Many traits are expressed as dominant- recessive traits. If a gene pair consists of two alleles, and one is expressed and the other is not they are dominant and recessive. The expressed al ...

(2 pages) 58 0 4.0 Mar/2006

Subjects: Science Essays > Biology

Chapter 19: Speciation

processes have been introducing changes in the gene pools of its populations. Remember, particular alleles give rise to the heritable traits of populations. As an outcome of mutation, genetic drift, ... populations. As an outcome of mutation, genetic drift, gene flow, and natural selection, different alleles can increase or decrease in frequency, or even disappear over time.Given the variation in ph ...

(6 pages) 47 0 1.0 May/2006

Subjects: Science Essays > Biology

Sickle Cell Anemia

ell Anemia is the specific name of a form of sickle-cell disease in which there are two of the same alleles (position on DNA) that mutates and causes Hgb S which includes sickle-hemoglobin C, sickle b ...

(3 pages) 17 0 0.0 Dec/2006

Subjects: Humanities Essays > Health & Medicine > Diseases

Sordaria Lab

ad analysis. "Strains of Sordaria have different colored ascospores, a heritable trait in which the alleles are found at the same locus and inherited in typical Mendelian dominance-recessiveness." (Th ... matids during meiosis I changes the order of spore color formation in the ascus. Segregation of the alleles at the first meiotic division (MI) results in the sequence 4+:4g or 4g:4+ when no crossing o ...

(6 pages) 46 0 5.0 Nov/2001

Subjects: Science Essays > Biology

The causes and effects of antibiotic resistance

organisms, are genetically variable. These variations occur by natural mutation giving rise to new alleles of genes. Natural selection can change the frequency of these alleles in the population so t ... istant, by the following steps:• Within natural populations of bacteria, some individuals have alleles of genes which give resistance to a particular antibiotic• bacteria cause an infection, ...

(1 pages) 42 0 4.0 Aug/2007

Subjects: Science Essays > Biology

Does Personality Has A Genetic Basis?

ng a characteristic (physical or chemical).5 Each gene may have two or more different forms, called alleles.5 If the inherited pairs of alleles are similar they will form the dominant genes, and if th ...

(7 pages) 102 1 3.7 Feb/2008

Subjects: Social Science Essays > Psychology

Natural Selection

t can be described as a random change in a small gene pool due to sampling errors in propagation of alleles or chance (Campbell, et al 2007). Genetic drift can occur in two ways; bottleneck effect and ...Gene flow is another mechanism of evolution. Gene flow occurs when a population may gain or lose alleles by the migration of fertile individuals between populations or when gametes are transferred ...

(5 pages) 177 0 4.0 Jun/2008

Subjects: Science Essays > Biology

Natural Selection

organisms. Evolution occurs when natural selection produces changes in the relative frequencies of alleles in a population’s gene pool, all of which has formed specific mechanisms.For years, many ...

(4 pages) 68 1 3.0 Jul/2009

Subjects: Science Essays > Biology