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ISCI 10 B CH 10 Nickel


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


crossmating 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 of 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

inheritance in which heterozygotes have a phenotype intermediate between the phenotypes of the two homozygotes


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

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