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Genetics 1
Test 1
27
Other
Undergraduate 3
02/10/2013

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Term
reciprocal crosses
Definition
switching the pollen source (male or female)
Term
law of segregation
Definition
traits are determined by genes which exist in pairs. Each parent only gives one gene and this gene is random.
Term
Alleles
Definition
alternative forms that genes can exist in for example Y and y (yellow or green allele)
Term
incomplete dominance
Definition
intermediate phenotype ex. pink
Term
co dominance
Definition
Phenotype is both alleles ex. blood type
Term
epistasis
Definition
for some traits, the phenotype can be affected nu alleles at two or more different genes (enzymes)
Term
pleiotropic
Definition
mutants that have multiple phenotypic effects
Term
chiasma
Definition
point where crossing over occurs during meiosis
Term
equational division
Definition
anaphase II
Term
reductional division
Definition
anaphase I
Term
synapsis
Definition
homologous chromosomes pairs line up
Term
synaptonemal complex
Definition
when pair up, offers precise pairing
Term
XXY
Definition
Klinefelters syndrome-sterile
Term
XO
Definition
Tuners syndrome-sterile
Term
euploids
Definition
individuals that have a normal chromosomal constitution
Term
aneuploids
Definition
abnormal number of chromosomes
Term
patau syndrome
Definition
chromosome 13
Term
edward syndrome
Definition
chromosome 18
Term
down syndrome
Definition
chromosome 21
Term
heterochromatin
Definition
inactivated tightly packed x chromosome
Term
euchromatin
Definition
loosely packed x chromosome
Term
dosage compensation
Definition
the process in which one of the mammalian x chromosomes is inactivated; equalizing the number of active x linked genes in the two sexes
Term
penetrance
Definition
the percent of genotypically mutant individuals that actually exhibit the mutant phenotype
Term
complete penetrance
Definition
all mutant individuals show mutant phenotype
Term
incomplete penetrance
Definition
not all mutant individuals show the mutant phenotype
Term
linkage group
Definition
all the genes that are linked to each other; all the genes that map to the same chromosome
Term
locus
Definition
site on the chromosome where the gene is located
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