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Ch. 3 Genetics Vocab
vocab flashcards
18
Biology
7th Grade
01/31/2012

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Term
trait
Definition
physical characteristic
Term
heredity
Definition
the passing of traits from parent to offspring
Term
genetics
Definition
the study of heredity
Term
purebred
Definition
an organism that always produces offspring with the same form of a trait as the parent
Term
gene
Definition
factor that controls a trait
Term
allele
Definition
the different forms of a gene
Term
dominant allele
Definition
an allele whose trait always shows up in the organism when the allele is present
Term
recessive allele
Definition
an allele that is masked when a dominant allele is present
Term
hybrid
Definition
an organism that has two different alleles for a trait; an organism that is heterozygous for a particular trait
Term
probability
Definition
the likelihood that a particular event will occur
Term
punnett square
Definition
a chart that shows all the possible combinations of alleles that can result from a genetic cross
Term
phenotype
Definition
physical appearance or visible traits
Term
genotype
Definition
genetic makeup of an organism - represented with 2 letters
Term
homozygous
Definition
having two identical alleles for a trait
Term
heterozygous
Definition
having two different alleles for a trait
Term
sperm
Definition
male reproductive cell
Term
egg
Definition
female reproductive cell
Term
meiosis
Definition
process of cellular division that results in sex cells having half the normal number of chromosomes
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