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answer for HL GENETICS (as requested)
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12-06-2008 5:31pm#1Hi,
so i've tried the crosses and if this is right,
I effing done it wrong in my exam
:(
ill add the other ans in a min
(b) In the fruit fly, Drosophila, the allele for grey body (G) is dominant to the allele for ebony body (g)
and the allele for long wings (L) is dominant to the allele for vestigial wings (l). These two pairs of
alleles are located on different chromosome pairs.
(i) Determine all the possible genotypes and phenotypes of the progeny of the following cross:
grey body, long wings (heterozygous for both) X ebony body, vestigial wings.
ANS:
X X X Y
F1 genotype:
X X X Y
g G g G
l L l L
F1 gametes Xgl XGL Xgl YGL
F2 gametes XXglgl XYglGL XXGLgl XYGLGL
F2 phenotype FEMALE EBONY, SHORT WINGS x1
MALE GERY,LONG WINDS x1
MALE GREY, LONG WINGS x2
(c) Haemophilia in humans is governed by a sex-linked allele. The allele for normal blood clotting (N)
is dominant to the allele for haemophilia (n).
(ii) Determine the possible genotypes and phenotypes of the progeny of the following cross:
haemophilic male X heterozygous normal female.
it doesnt say if the female is hetro/homozeygous though!!
X X X Y
N N N n
XXNN XYNn XXNN XYNn
Female, normal clotting x2
Male, normal clotting x2
0
Comments
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Hi,
so i've tried the crosses and if this is right,
I effing done it wrong in my exam:(
ill add the other ans in a min
(b) In the fruit fly, Drosophila, the allele for grey body (G) is dominant to the allele for ebony body (g)
and the allele for long wings (L) is dominant to the allele for vestigial wings (l). These two pairs of
alleles are located on different chromosome pairs.
(i) Determine all the possible genotypes and phenotypes of the progeny of the following cross:
grey body, long wings (heterozygous for both) X ebony body, vestigial wings.
ANS:
X X X Y
F1 genotype:
X X X Y
g G g G
l L l L
F1 gametes Xgl XGL Xgl YGL
F2 gametes XXglgl XYglGL XXGLgl XXGLgl
F2 phenotype FEMALE EBONY, SHORT WINGS x1
MALE GERY,LONG WINDS x1
FEMALE GREY LONG WINGS x2
im an idiot ur right i got it right as well tho :P
didnt read ur answer properly :P but dont think you had to say male/female cuz if you did i think u have that part wrong :P you will get 1 female grey long vestgian wings and 1 male
other's answer
1 female haemophiliac
1 female carrier
1 male haemophiliac
1 male carrier0 -
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Hi,
so i've tried the crosses and if this is right,
I effing done it wrong in my exam:(
ill add the other ans in a min
(b) In the fruit fly, Drosophila, the allele for grey body (G) is dominant to the allele for ebony body (g)
and the allele for long wings (L) is dominant to the allele for vestigial wings (l). These two pairs of
alleles are located on different chromosome pairs.
(i) Determine all the possible genotypes and phenotypes of the progeny of the following cross:
grey body, long wings (heterozygous for both) X ebony body, vestigial wings.
ANS:
X X X Y
F1 genotype:
X X X Y
g G g G
l L l L
F1 gametes Xgl XGL Xgl YGL
F2 gametes XXglgl XYglGL XXGLgl XXGLgl
F2 phenotype FEMALE EBONY, SHORT WINGS x1
MALE GERY,LONG WINDS x1
FEMALE GREY LONG WINGS x2
It didn't ask anything about the sex of the fly though.
GgLl x ggll
Gametes: GL, Gl, gL, gl x gl
Possible genotypes: GgLl, GGll, ggLl, ggll
Possible phenotypes: Grey body, long wings (GgLl)
Grey body, vestigial wings (GGll)
Ebony body, long wings (ggLl)
Ebony body, vestigial wings (ggll)0 -
IrishKnight wrote: »If they don't ask for it don't give it.
The cross would be;
GgLl ggll
G,g,L,l g,l
Gg gg Ll ll
Genoptype
GgLl ggll Ggll ggLl
25% 25% 25% 25%
Phenotype
Grey with long wings 25%
Grey with small wings 25%
Ebony with long wings 25%
Ebony with short wings 25%
correct my friend
dont have to list % either unless they ask for ratios or % 0 -
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superLeetive wrote: »It didn't ask anything about the sex of the fly though.
GgLl x ggll
Gametes: GL, Gl, gL, gl x gl
Possible genotypes: GgLl, GGll, ggLl, ggll
Possible phenotypes: Grey body, long wings (GgLl)
Grey body, vestigial wings (GGll)
Ebony body, long wings (ggLl)
Ebony body, vestigial wings (ggll)
i need glases, sorry 0 -
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IrishKnight wrote: »If they don't ask for it don't give it.
The cross would be;
GgLl ggll
G,g,L,l g,l
Gg gg Ll ll
Genoptype
GgLl ggll Ggll ggLl
25% 25% 25% 25%
Phenotype
Grey with long wings 25%
Grey with small wings 25%
Ebony with long wings 25%
Ebony with short wings 25%wrong me thinks, u missed the grey long wings
having a dad as a doctor really helped LOL
How can I be wrong if u just told the other guy that he was right when I had the same answer as him apart from the fact that I said "vestigial" as it says in the Q instead of "short" as he did.
I didn't miss grey, long wings..it's there!0 -
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