1. In progeny of the cross Aa Bb Cc x aa Bb Cc , what proportion will be A_ B_ C
ID: 51423 • Letter: 1
Question
1. In progeny of the cross Aa Bb Cc x aa Bb Cc, what proportion will be A_ B_ C_? How many different kinds of gametes can be produced by each parent?
2. In fruit flies (Drosophila melanogaster) the bn+ allele for wild type red dull eyes is dominant to the bn allele for brown eyes. Another gene affects wing shape; for this gene, the ct+ allele for wild type wingsis dominant to the ct allele, which gives "cut" wings, with jagged edges. A fly with dull red eyes and wild type wings was crossed with a fly that had dull red eyes and cut wings, and the following progeny were obtained:
16 dull red eyes, normal wings
14 dull red eyes, cut wings
5 brown eyes, normal wings
5 brown eyes, cut wings
What were the genotypes of the parents?
Explanation / Answer
Answer 1:This is the tri-hybrid cross AaBbCc x aaBbCc, we will draw Punnett Square.
The gametes of AaBbCc are ABC,Abc,ABc,AbC,abc,aBC,abC,aBc
The gametes of aaBbCc are aBC,aBc,abC,abc
ABC
(gamete)
abc
(gamete)
aBC
(gamete)
abC
(gamete)
Abc
(gamete)
aBc
(gamete)
ABc
(gamete)
AbC
(gamete)
aBC
(gamete)
AaBBCC
aaBbCc
aaBBCC
aaBbCC
AaBbCc
aaBBCc
AaBBCc
AaBbCC
abC
(gamete)
AaBbCC
aabbCc
aaBbCC
aabbCC
AabbCc
aaBbCc
AaBbCc
AabbCC
abc
(gamete)
AaBbCc
aabbcc
aaBbCc
aabbCc
Aabbcc
aaBbcc
AaBbcc
AabbCc
aBc
(gamete)
AaBBCc
aaBbcc
aaBBCc
aaBbCc
AaBbcc
aaBBcc
AaBBcc
AaBbCc
The proportion of A_B_C_ are
AaBBCC:AaBbCC:AaBbCc:AaBBCc
1:2:4:2
and the gamete produced by two parents are:
The gametes of AaBbCc are ABC,Abc,ABc,AbC,abc,aBC,abC,aBc
The gametes of aaBbCc are aBC,aBc,abC,abc
Answer 2: The genotypes of the parent will be bn+bnct+ct & bn+bnctct
ABC
(gamete)
abc
(gamete)
aBC
(gamete)
abC
(gamete)
Abc
(gamete)
aBc
(gamete)
ABc
(gamete)
AbC
(gamete)
aBC
(gamete)
AaBBCC
aaBbCc
aaBBCC
aaBbCC
AaBbCc
aaBBCc
AaBBCc
AaBbCC
abC
(gamete)
AaBbCC
aabbCc
aaBbCC
aabbCC
AabbCc
aaBbCc
AaBbCc
AabbCC
abc
(gamete)
AaBbCc
aabbcc
aaBbCc
aabbCc
Aabbcc
aaBbcc
AaBbcc
AabbCc
aBc
(gamete)
AaBBCc
aaBbcc
aaBBCc
aaBbCc
AaBbcc
aaBBcc
AaBBcc
AaBbCc
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