Download Genes and Natural Selection

Genes and Natural
Selection
BY: Shanelle Cabral
Sierra Jacoby
Brenen Basaldua
Who started this
• Darwin proposed his theory of evolution, cell
division, genes, and chromosomes had not yet
been discovered
Deoxyribonucleic acid
• “DNA”
• Double stranded molecule with
the shape of a helix.
• Contains genetic information
known as “genes”.
• Capable of copying itself so
that the information can be
passed from one generation to
another.
Genes
• Is a unit of heredity
information
• Contains the chemical
instructions for making
proteins, and these proteins
are largely responsible for the
structure and function of
organisms.
Chromosomes
• Structures consisting of DNA and protein
• Found in cellular structure called the nucleus
• A nucleus acts as the control center of the call.
Asexual reproduction
• Offspring receive their genes from only one
parent, and as a result, they are identical to
the parent in all of their characteristic.
• This type of reproduction introduces no
variety into the population.
Sexual reproduction
• Genes are randomly
assorted into new
combinations during the
formation of sex cells
• Sex cells (eggs, sperm,
pollen, etc.) are called
gametes.
• A gene pool is all of the
genes in a given population
that exist at a given time
Fitness
• Measured in terms of
the number of its
own genes that are
presented in the next
generation of a
population.