passing traits from parent to offspring.. physical characteristics inherited by the offspring from...
TRANSCRIPT
HEREDITY Passing traits from parent to
offspring.
Traits Physical characteristics inherited by the
offspring from the parents. Ex. Hair color Eye color Skin tone Ear shape
Traits are Controlled by Genes Genes are located on your chromosomes Individuals inherit genes from your
parent. Your cells contain 23 chromosome pairs
Your are literally half your mother and father.
You receive half the pair from you mother.
You receive half the pair from your father .
Though the gene may be present on both, the form of the gene may be different
Different forms of the same gene are called alleles.
Human Chromosomes
Genetics The study of how traits are
inherited through the inactions of alleles.
Alleles interact to produce traits
Phenotype describes the physical characteristic that is displayed by your genes
Ex. Blue eyes
Genotype describes the actual genes that you have on your DNA
Ex. (blue allele)+(blue allele)
Dominant Alleles When paired a dominate allele will cover up
the phenotype of a recessive allele. Dominate alleles are described with a capital
letter Ex. brown eyes (B) or blue (e) produces “Be” a
brown eye. “BB” will also produce a brown eye.
Recessive Alleles The phenotype for recessive alleles will only
appear if two recessive alleles are paired. Recessive alleles are described with a lower
case letter Ex. A blue eye allele (e) and a blue eye allele
(e) produces “ee” blue eyes
Heterozygous This means “not pure or different.”
Allele pairs are heterozygous if the gene pairs are dominate/recessive pairs.
Ex. Ee, Bd, Aa, Ts
This means “pure or the same.” Allele pairs are homozygous if both alleles are either both dominate or both recessive.
Ex. EE, TT, aa, bb, CC, ff
Homozygous