Chpt 11 Vocb Flashcards
a segment of DNA whose sequence of nucleotides codes for a specific functional product
Gene
The study of heredity.
Genetics
a trait that is expressed in a heterozygous organism.
Dominant
a trait whose expression is masked in a heterozygous organism.
Recessive
alternate forms of a gene
Alleles
having two identical alleles for a given trait.
Homozygous
having two different alleles for a given trait; a carrier
Heterozygous
the genetic makeup of an organism
Genotype
is the appearance of visible traits of an organism.
Phenotype
a genetic cross between individuals differing in one trait.
Monohybrid cross
a genetic cross between individuals differing in two traits.
Dihybrid Cross
when both alleles in a heterozygous organism are expressed
Codominance
are genes that have more than two allelic forms.
Multiple Alleles
(Polygenic traits)- when the expression of a trait is controlled by several genes and also influenced by the environment.
Multifactorial Trait
genes that are located on the same chromosome.
Linked Genes
a trait determined by a gene carried on the X chromosome.
X- Linked Gene
is a method of organizing the chromosomes of a cell in relation to number, size, and type.
Karyotype
failure of a pair of chromosomes to separate during meiosis.
Nondisjunction
A condition known as what exists when three chromosomes are present instead of two.
trisomy
an extra X chromosome in a male (XXY)
Klinefelter Syndrome
(Monosomy X)– only one sex chromosome (XO)
Turner Syndrome
