, ▁and ▁slow ▁rip ening ▁for ▁long ▁sh elf - life ▁favor able ▁to ▁ship ▁by ▁ground ▁transport ation ▁from ▁far ms ▁to ▁stores ▁nation wide ▁for ▁consumption ▁within ▁two ▁weeks ▁of ▁har vest . ▁In ▁US ▁and ▁Canadian ▁gro c ery ▁stores , ▁fresh ▁st raw ber ries ▁are ▁typically ▁sold ▁in ▁pl astic ▁cl am sh ells , ▁and ▁are ▁among ▁the ▁top ▁fresh ▁produce ▁items ▁in ▁gro c ery ▁reven ues . ▁One ▁market ing ▁analysis ▁identified ▁st raw ber ries ▁and ▁other ▁ber ries ▁as ▁a ▁source ▁of ▁" h app iness " ▁for ▁consum ers . ▁ ▁Gen et ics ▁ ▁Modern ▁st raw ber ries ▁have ▁complex ▁oct ap lo id ▁gen et ics ▁( 8 ▁sets ▁of ▁chrom os om es ), ▁a ▁trait ▁favor ing ▁DNA ▁extra ctions . ▁St raw ber ries ▁have ▁been ▁sequ enced ▁to ▁display ▁ 7 , 0 9 6 ▁gen es . ▁St raw ber ries ▁suffer ▁from ▁severe ▁in bre eding ▁de pression , ▁and ▁most ▁cultiv ars ▁are ▁highly ▁heter o zy g ous . ▁In ▁many ▁entry ▁level ▁Bi ology ▁classes , ▁st raw ber ries ▁are ▁used ▁to ▁demonstrate ▁the ▁extra ction ▁of ▁DNA ▁due ▁to ▁their ▁oct op lo id ▁structure . ▁ ▁All er gy ▁ ▁Some ▁people ▁experience ▁an ▁an ap hy la ct oid ▁reaction ▁to ▁e ating ▁st raw ber ries . ▁The ▁most ▁common ▁form ▁of ▁this ▁reaction ▁is ▁or al ▁aller gy ▁synd rome , ▁but ▁sympt oms