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13 terms

Cohen Genetics Test

STUDY
PLAY
Principle of Independent Assortment
states that genes for different traits can segregate independently during the formation of gametes
incomplete dominance
neither allele is truly dominant. A heterozygote's phenotype is a mixture of both traits (RRxR'R'=RR')
codominance
both alleles are dominant. there's a presentation of both traits in a heterozygote (RRxWW=RW or red and white spots)
multiple alleles
there are more than two alleles available for the trait. ex: coat color in rabbits (refer to notes)
polygenic inheritance
traits are controlled by more than one gene. ex: skin, hair, eye color, height weight, etc. traits with lots of variation.
karyotype
A picture of all the chromosomes in a cell arranged in pairs
SRY gene
causes gonads to become testes rather than ovaries
nondisjunction
when homologs (paired chromosomes) fail to separate during meiosis. daughter cells have too many or too few chromosomes
Blood types
Type A: AA or AO, Type B: BB or BO, Type O: OO Type AB: AB
sex linked traits
traits that are dominant or recessive depending on gender, disorder pertinent to gender, ie females cant be colorblind..traits can only be carried or present on X or female gene
genetic disorders and diseases
REFER TO NOTES
sex linkage
an association between genes in sex chromosomes that makes some characteristics appear more frequently in one sex than in the other
sickle cell
Deformed red blood cells that can lead to numerous symptoms and caused by a genetic mutation in the hemoglobin protein. AA= normal hemoglobin AS= sickle cell trait SS= full disease