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24 Cards in this Set

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  • Back
variation of a particular inherited character
trait
study of heredity
genetics
offspring of two different true-breeding varieties
hybrid
having identical alleles for a gene
homozygous
having different alleles for a gene
heterozygous
descriptive of an allele in a heterozygous individual that appears to be the only one afftecting a trait
dominant
descriptive of an allele in a heterozygous individual that does not appear to affect a trait
recessive
diagram showing the probabilities of the possible outcomes of a genetic cross
punnett square
observable traits of an organism
phenotype
genetic makeup of an organism; an organism's combination of alleles
genotype
mating of an individual of unknown genotype but dominant phenotype with a homozygous recessive individual
testcross
inheritance in which heterozygotes have a phenotype intermediate between the phenotypes of the two homozygotes
intermediate inheritance
inheritance pattern in which a heterozygote expresses the distinct traits of both alleles
codominance
combined effect of two or more genes on a single character
polygenic inheritance
specific location of a gene on a chromosoe
gene locus
condition in which an individual has three number 1 chromosomes, resulting in Down syndrome
trisomy 21
general set of symptoms in people with trisomy 21
Down syndrome
even during meiosis in which homologous chromosomes or sister chromatids fail to seperate
nondisjunction
change to a chromosome in which part of the chromosome is repeated
duplication
change to a chromosome in which a fragment of the chromosome is reversed
inversion
genetic element that moves from one location to another in a genome
transposon
family tree that records and traces the occurrence of trait in a family
pedigree
individual who has one copy of the allele for a recessive disorder and does not exhibit symptoms
carrier
person trained to collect, analyze, and explain data about human inheritance patterns
genetic counselor