CH 10 – Genetics

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variation of a particular inherited character
study of heredity
process by which sperm from one flower’s pollen fertilizes the eggs in a flower of a different plant
offspring of two different true-breeding varieties
monohybrid cross
mating of two organisms that differ in only one character
alternative form of a gene
having identical alleles for a gene
having different alleles for a gene
descriptive of an allele in a heterozygous individual that appears to be the only one affecting a trait
descriptive of an allele in a heterozygous individual that does not appear to affect a trait
Punnett square
diagram showing the probabilities of the possible outcomes of a genetic cross
observable traits of an organism
genetic makeup or an organism; an organism’s combination of alleles
mating of an individual of unknown genotype but dominant phenotype with a homozygous recessive individual
dihybrid cross
mating of two organisms that differ in two characters
intermediate inheritance (incomplete dominance)
-inheritance in which heterozygotes have a phenotype intermediate between the phenotypes of the two homozygotes
-dominant gene isn’t completely dominant over the recessive gene
(Red + White = pink)
inheritance pattern in which a heterozygote expresses the distinct traits of both alleles (blood types LaLa, LaLo)
polygenic inheritance
combined effect of two or more genes on a single character
chromosome theory of inheritance
generalization that genes are located on chromosomes and that the behavior of chromosomes during meiosis and fertiliaztion accounts for inheritance patterns
gene locus
specific location of a gene on a chromosome
genetic linkage
tendency for alleles of genes on the same chromosome to be inherited together
sex-linked gene
gene located on a sex chromosome
offspring identical in appearance to itself generation after generation
Mendel’s principle of segregation
The two alleles for a character segregate (separate) during the formation of gametes (sex cells), so that each gamete carries only one allele for each character
particulate hypothesis of inheritance
heritable factors retain their identity generation after generation
Categories: Genetics