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22 terms

IS10B PCHS CH 10 Nickel

ISCI 10 B CH 10 Nickel
STUDY
PLAY
trait
variation of a particular inherited character
genetics
study of heredity
cross-fertilization
process by which sperm from one flower's pollen fertilizes the eggs in a flower of a different plant
hybrid
offspring of two different true-breeding varieties
monohybrid
crossmating of two organisms that differ in only one character
allele
alternative form of a gene
homozygous
having identical alleles for a gene
heterozygous
having different alleles for a gene
dominant
descriptive of an allele in a heterozygous individual that appears to be the only one affecting a trait
recessive
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
phenotype
observable traits of an organism
genotype
genetic makeup of an organism; an organism's combination of alleles
testcross
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
inheritance in which heterozygotes have a phenotype intermediate between the phenotypes of the two homozygotes
codominance
inheritance pattern in which a heterozygote expresses the distinct traits of both alleles
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 fertilization 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