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CSULB Biol 212 12.1
Chapter 12.1 Vocab
28
Biology
Undergraduate 1
04/20/2011

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Term
reciprocal crosses
Definition
A pair of matings in one of which a female of genotype A mates with a male of genotype B, and in the other of which a female of genotype B mates with a male of genotype A.
Term
Assumption supported by Gregor Mendel's experimental evidence
Definition
Each parent contributes equally to offspring.
Term
character
Definition
An observable physical feature. Ex: flower color
Term
trait
Definition
A specific form of a character. Ex: brown eyes and blue eyes
Term
heritable trait
Definition
pass from parent to offspring
Term
hybrid
Definition
offspring of crosses between organisms differing in one or more traits
Term
gene
Definition
unit of inheritance; a sequence on a DNA molecule that resides at the locus and encodes a particular character
Term
genome
Definition
totality of all the genes of an organisms
Term
allele
Definition
The alternate form of a genetic character found at a given locus on a chromosome.
Term
law of segregation
Definition
The two copies of a gene separate when an individual makes gametes
Term
law of independent assortment
Definition
Alleles of different genes assort independently during gamete formation.
Term
mutation
Definition
rare, stable, inherited changes in the genetic material
Term
incomplete dominance
Definition
Some alleles are neither dominant nor recessive. Ex: snapdragons with colors pink, white, or red in F2 Gen.
Term
codominance
Definition
Two alleles at one locus produce phenotypes that are both present in the heterozygote.Ex: ABO blood group system - three alleles at one locus
Term
Pleiotropic
Definition
A single allele can have multiple phenotypic effect.
Term
epistasis
Definition
Phenotypic expression of one gene influenced by another gene. Ex: Coat color in Labradors.
Term
Penetrance
Definition
Proportion of individuals with a certain genotype that show the phenotype.
Term
Expressivity
Definition
Degree to which genotype is expressed in an individual
Term
linkage group
Definition
Formed by all of the loci on a chromosome
Term
absolute linkage
Definition
(rare) genes at different loci on the same chromosome do sometimes separate
Term
recombinant frequencies (the how-to)
Definition
divide number of recombinant offspring by total number of offspring.
*RF are greater for loci that are farther apart.
Term
genetic maps
Definition
Recombinant frequencies used to show the arrangement of genes along a chromosome
Term
sex-linked inheritance
Definition
a character governed by loci on the sex chromosomes. Ex. eye color in drosophila
Term
Y chromosome
Definition
Carries few genes
Term
X chromosome
Definition
Carries many genes
Term
sex pilus
Definition
a projection that initiates contact between bacterial cells
Term
conjugation tube
Definition
Cytoplasmic bridge that forms between cells
Term
plasmids
Definition
Small circular chromosomes; bacteria has these
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