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Vocabulary for Unit 10


A segment of DNA on a chromosome that codes for a specific trait

homologous chromosome

the chromosomes that make up a pair, one chromose from each parent


sex cells that have half the number of chromosomes as the parent's cell


a cell or organism having a single set of chromosomes


the process by which one haploid gamete combines with another haploid gamete


an organism or cell having two sets of chromosomes or twice the haploid number


cell division that produces reproductive cells in sexually reproducing organisms

crossing over

the interchange of sections between pairing homologous chromosomes during the prophase of meiosis


the science of heredity


Alternative forms of a gene for each variation of a trait of an organism.


a trait that shows up whenever present


a specific rait that is hidden unless two alleles are present


an organism with two of the same alleles


an organism with two different alleles


organisms allele pairs


observable characteristic or outward expression of an allele pair; the trait you an see

law of segregation

two aleles for each trait separate during during meiosis and two alleles for that trait unit during fertilization


organisms that have a heterozygous allele combination

law of independent assortment

a random distribution of alleles accurs during gamete formation

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