3rd Nine Weeks Exam Flashcards
Father of genetics
Gregor Mendel
Process of a plant fertilizing itself, pollination
Self-fertilization
Fertilizing a flower with pollen from another flower
Cross-fertilization
Both alleles of an organism are not the same
Heterozygous
Both alleles in an organism are the same
Homozygous
Trait that is expressed when factors for two opposing traits are present
Dominance
Trait that is hidden when two genes for opposing traits are present
Recessive
Diagram used to determine the probability of the offsprings phenotype and genotype
Punnett square
When two alleles are both expressed resulting in a blending
Incomplete dominance
Expression of both alleles in a heterozygous offspring
Codominance
Doesn’t exhibit the characteristic but has the gene for that trait
Carrier
The genetic makeup of an individual organism
Genotype
Physical characteristics
Phenotype
Several different alleles at a given locus ex. Blood types
Multiple alleles
Mating an organism that has the dominant phenotype but unknown genotype with another organism that has the homozygous recessive phenotype
Test cross
Chart used to find presence or absence of a trait in a number of generations
Pedigree
A cross between individuals that deals with only one set of alleles, short and tall pea plant
Monohybrid cross
Cross dealing with two traits
Dihybrid cross
Know the genotypes for blood types
AA Ao BB Bo oo AB
Person with 2 X chromosomes
Female
Has an x and a Y chromosome
Males
Sex cells
Gametes
Starting with one cell the final results of meiosis are __ __ cells
4, haploid
Cell division in which the chromosome number is reduced from diploid to haploid
Meiosis
Trait carried only on the x sex chromosome is
X/sex linked
Any chromosome other than the sex Chromosomes
Autosomes
Reproduction that Produces identical offspring
Asexual
A genetic change involving either the number of chromosomes or arrangement of genes on a chromosome
Chromosomal changes
Changing of the gene itself, alters the sequence of nucleotides
Gene mutations
Chromosome number is exact multiple of the haploid number
Euploidy
Having two or more sets of chromosomes
Polyploidy
Having 3 complete sets of chromosomes
Triploidy
Either lack chromosomes or have extra ones
Aneuploids
The failure of a pair of homologous chromosomes to separate during meiosis
Nondisjunction
Down syndrome is caused by a human __ condition
Aneuploid