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ch 9 voc DC updated
ch 9 voc DC updated
33
Biology
Not Applicable
04/07/2011

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Term
allele
Definition
each of two alternative forms of a gene
Term
anther
Definition
the male reproductive part of a flower
Term
codominance
Definition
an inheritance relationship in which NEITHER of two alleles of the same gene are dominate or recessive. BOTH ARE EXPRESSED.
Term
complete dominance
Definition
an inheritance relationship in which one allele is completely dominant over the other; both Bb and BB have the same phenotype
Term
cross-pollination
Definition
a reproductive process in which pollen from one plant is transferred to the stigma of another plant (Two plants)
Term
dihybrid cross
Definition
a cross in which two characteristics are tracked
Term
dominant
Definition
factor that masks the presence of another factor for the same characteristic
Term
F1
generation
Definition
the offspring of cross-pollinated P1
generation plants (parents)
Term
F2
generation
Definition
the offspring of self-pollinated F1
generation plants (same plant)
Term
genetics
Definition
the field of biology devoted to understanding how traits are transmitted from parents to offspring
Term
genotype
Definition
an organism's GENETIC makeup
Term
genotypic ratio
Definition
the probable ratio of genotypes that appear in offspring (produced by a cross)
Term
heredity
Definition
the transmission of traits from parents to their offspring
Term
heterozygous
Definition
two alleles of a pair are DIFFERENT
Term
homozygous
Definition
two alleles of a pair are ALIKE (same trait)
Term
incomplete dominance
Definition
an inheritance relationship that occurs when both alleles influence the phenotype; neither is dominant
Term
law of independent assortment
Definition
law stating that pairs of genes separate
independently of one another in meiosis
Term
law of segregation
Definition
law stating that pairs of genes separate in meiosis and each
gamete receives one gene of a pair
Term
molecular genetics
Definition
the study of the structure and function of chromosomes
and genes
Term
monohybrid cross
Definition
a cross between individuals that involves one pair of
contrasting traits
Term
P1 generation
Definition
a strain obtained through self-pollination
Term
phenotype
Definition
the external appearance of an organism that is determined by the
individual’s genotype
Term
phenotype frequency (phenotypic ratio)
Definition
a ratio stating the number of times
a specific phenotype occurs in a population in a single generation
Term
pollination
Definition
the transfer of pollen from an anther to a stigma of a flower of the
same species
Term
probability
Definition
the number of times an event is expected to happen divided by the
number of opportunities for an event to happen
Term
Punnett square
Definition
a model used to establish the probabilities of the results of a
genetic cross
Term
pure
Definition
ability to always pass on a specific trait to offspring
Term
recessive
Definition
referring to an allele that is masked by the presence of another allele
for the same characteristic
Term
self-pollination
Definition
pollination involving the same flower, flowers on the same
plant, or two genetically identical plants
Term
stigma
Definition
an expanded apex of a pistil, supported by the style; the part of the pistil
that receives pollen
Term
strain
Definition
denotes a plant that is pure for a certain trait
Term
testcross
Definition
the crossing of an individual of unknown genotype with a
homozygous recessive individual to determine the unknown genotype
Term
trait
Definition
in genetics, a category within which alternate characteristics, such as height
and eye color, can be observed
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