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genetics
stephen ramirez
13
Science
7th Grade
02/10/2010

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Term
alleles
Definition
the different forms of a gene. Y and y are different alleles of the gene that determines seed coler
Term
dominant trait
Definition
a trait expressed preferentially ove another trait
Term
F1 generation
Definition
offspring of a cross between true breeding plants,homozygous forthe trait of intrest
Term
F2 generation
Definition
offspring of a cross involving the F1 gen
Term
genotype
Definition
the genetic constitution of an organism with respectto a trait. yellow seeds are dominant, but yellow seeded plants could havea genotype of either YY or Yy
Term
heterozygous
Definition
differing alleles fora trait in an individual, such as Yy
Term
homozygous
Definition
both alleles for a trait are the same in an individual
Term
hybrid
Definition
heterozygous;usually refferingto the offspring of two true-breeding individuals differing in the traits of intrest
Term
monohybrid cross
Definition
cross involving parentsdiffering in only one trait
Term
mutation
Definition
change in the DNA sequence of a geneto somenew,heritable form
Term
phenotype
Definition
the physical appearance of an organism with respect to a trait
Term
recessive trait
Definition
the opposte of dominant
Term
sex-linked
Definition
a gene coded on a sex chromosome,such as the X-chromosome linked genes of flies and man
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