In dogs dark (D) coat color is dominant to albino (d) and short (S) is dominant
ID: 15117 • Letter: I
Question
In dogs dark (D) coat color is dominant to albino (d) and short (S) is dominant over long (s) hair. If these effects are caused by two independently segregating gene pairs, write the most probable genotypes for the parents of each of the following crosses. If a parent could have either allele, indicate this by writing the genotype with a blank where either allele could occur.
Parental Phenotypes
Parental Genotypes
Phenotypes of Offspring
Dark Short
Dark Long
Albino Short
Albino Long
dark short X dark short
89
31
29
11
dark short X albino short
20
0
21
0
albino short X albino short
0
0
28
9
dark long X dark long
0
32
0
10
dark short X dark short
46
16
0
0
dark short X dark long
29
31
9
11
Parental Phenotypes
Parental Genotypes
Phenotypes of Offspring
Dark Short
Dark Long
Albino Short
Albino Long
dark short X dark short
89
31
29
11
dark short X albino short
20
0
21
0
albino short X albino short
0
0
28
9
dark long X dark long
0
32
0
10
dark short X dark short
46
16
0
0
dark short X dark long
29
31
9
11
Explanation / Answer
The parental genotypes should be:
DdSs x DdSs
DDSS x ddSS
ddSs x ddSs
Ddss x Ddss
DDSs x DDSs
DdSs x Ddss
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