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chapter 3
heredity, genes, alleles, etc.
24
Science
7th Grade
02/02/2011

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Term
heredity
Definition
the passing of genetic traits from parents to offspring.
Term
Gregor Mendel
Definition
discovered the principles of heredity while studying pea plants.
Term
self-pollinating plant
Definition
has both female and male reproductive structures. So pollen from one flower can fertilize the ovule of the same flower or the ovule of another flower on the same plant.
Term
cross-pollination
Definition
pollen from one plant fertilizes the ovule of a flower on a different plant
Term
dominant trait
Definition
the trait observed in the first generation when parents that have different traits are bred. In other words it is the trait that more commonly shows up.
Term
recessive traits
Definition
the trait that seems to fade into the background.
Term
gene
Definition
one set of instructions for an inherited trait
Term
allele
Definition
the form of a gene ex. hair color
Term
phenotype
Definition
the appearance of a trait
Term
genotype
Definition
the letters in a punnet square like Ff or ff or FF
Term
probability
Definition
the mathematical chance that something will happen
Term
homologous chromosomes
Definition
chromosomes that carry the same sets of genes.
Term
meiosis
Definition
a copying process that produces cells with half the usual number of chromosomes. each sex cell receives one-half of each homogulous pair.
Term
sex chromosomes
Definition
one pair of chromosomes that determine the sex of an individual.
Term
pedigree
Definition
a diagram that shows the occurrence of a genetic trait in several generations of a family.
Term
selective breeding
Definition
organisms with desirable characteristics are mated.
Term
first generation
Definition
first generation of offspring
Term
second generation
Definition
the offspring of first generation
Term
heterozygous
Definition
when one allele is dominant and the other is recessive. like Ff
Term
homozygous
Definition
when both alleles are either dominant or both alleles are recessive. like FF of ff
Term
phosphate
Definition
the sides of the DNA ladder composed of sugar.
Term
nucleotide
Definition
DNA is made of this subunit.
Term
adenine, thymine, guanine, and cytosine
Definition
these are four bases of DNA. Each has a pair. Adenine goes with thymine (AT or ta) and Guanine with cytosine (GC or CG)
Term
DNA
Definition
Is the Genetic material-the material that determine inherited characteristics. It stands for DeoxyriboNucleic Acid.
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