Dihybrid Practice 2 .docx - Name: DIMAYUGA IRAH ISABELLA...

Name: DIMAYUGA, IRAH ISABELLA M. Section: BS-PSY 2102
Worksheet No. 2
Dihybrid Cross
Genetic Crosses
that Involve 2
Traits
In rabbits, black hair
is dominant to brown
hair. Also in rabbits,
long straight ears are
dominant to floppy
ears.
These letters
represent the
genotypes and
phenotypes of the
rabbits:
BB = black hair EE = long ears
Bb = black hair Ee = long ears
bb = brown ee = floppy ears
1. A male rabbit with the genotype BBee is crossed with a
female rabbit with the genotype bbEe The square is set up below.
Fill it out and determine the phenotypes and proportions in the
offspring.
Be Be Be Be
bE BbEe BbEe BbEe BbEe
be Bbee Bbee Bbee Bbee
bE BbEe BbEe BbEe BbEe
be Bbee Bbee Bbee Bbee
a.How many out of 16 have black hair and long ears?
8/16= 50%
b.How many out of 16 have black hair and
floppy ears?