Chromosome Pgeneration s's c'c* ss C gamete formation gamete formation wi ld %3D s*c* SC fertilization HestenoS F, generation s's c'c backcross the F, flies with recessive parent s'sc'c Ss cc gamete formation gamete formation s*c SC s'c Sc* SC fertilization F, generation s's ctc s's c ss ctc SS C 1 wild-type : 1 scarlet, curled : 1 curled phenotypic ratio 1 scarlet Figure 3.4: If the scarlet gene and curled gene are on separate chromosomes, they assort independently.

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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Chromosome
s's c*c*
s cC
Pgeneration
gamete formation
gamete formation
st-
wild
Hestcncs
fertilization
backcross the F, flies
with recessive parent
F, generation
s's ctc
Ss cc
gamete formation
s*sc*c
gamete formation
SC
fertilization
F, generation
phenotypic ratio
s*s cc
ss c'c
s's ctc
1 wild-type : 1 scarlet, curled : 1 curled : 1 scarlet
SS C
Figure 3.4: If the scarlet gene and curled gene are on
separate chromosomes, they assort independently.
s* c*
st, c+
P generation
S C
female
male
S,C
gamete formation
gamete formation
s*c+
SC
fertilization
backcross the female F,
flies with recessive parent
F1 generation
chomo
recess
female
male
gamete formation
gamete formation
no crossover
crossover
UNLINKED
s'c*
SC
stc+
SC
sc*
SC
ststctct
fertilization
F, generation C
S C
S C
s* c
scarlet,
wild-type
curled
scarlet
curled
non-recombinants:
recombinants:
lower proportion of flies
greatest proportion of flies
Figure 3.5: If the scarlet gene and curled gene are on the same
chromosome (linked), they will not assort independently.
Transcribed Image Text:Chromosome s's c*c* s cC Pgeneration gamete formation gamete formation st- wild Hestcncs fertilization backcross the F, flies with recessive parent F, generation s's ctc Ss cc gamete formation s*sc*c gamete formation SC fertilization F, generation phenotypic ratio s*s cc ss c'c s's ctc 1 wild-type : 1 scarlet, curled : 1 curled : 1 scarlet SS C Figure 3.4: If the scarlet gene and curled gene are on separate chromosomes, they assort independently. s* c* st, c+ P generation S C female male S,C gamete formation gamete formation s*c+ SC fertilization backcross the female F, flies with recessive parent F1 generation chomo recess female male gamete formation gamete formation no crossover crossover UNLINKED s'c* SC stc+ SC sc* SC ststctct fertilization F, generation C S C S C s* c scarlet, wild-type curled scarlet curled non-recombinants: recombinants: lower proportion of flies greatest proportion of flies Figure 3.5: If the scarlet gene and curled gene are on the same chromosome (linked), they will not assort independently.
Exercise I:Come up with the P, F1, and F, for a cross between the autosomal recessive
mutations cinnabar and ebony as if they are on:
1. different chromosomes
2. the same chromosome
If you need help, use the crosses on p. 28 as a guideline or see below:
li 2 A
tv
Transcribed Image Text:Exercise I:Come up with the P, F1, and F, for a cross between the autosomal recessive mutations cinnabar and ebony as if they are on: 1. different chromosomes 2. the same chromosome If you need help, use the crosses on p. 28 as a guideline or see below: li 2 A tv
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