2. In dogs, barer trait is controlled by a dominant gene D and the silent trait by the recessive gene d. Normal tail is dependent on a dominant gene M and the screw m. Give the probable genotypes of the parents in the following crosses: Phenotype of parents Phenotypes of progeny Genotypes of parents Barker Barker Silent Silent normal screw normal normal a. silent normal x silent normal 0 0 6 2 b. barker normal x silent normal c. barker normal x silent screw d. barker screw x silent normal e. barker screw x silent screw 7 2 8 3 4 5 5 3 6 0 0 0 0 6 0 7

Human Anatomy & Physiology (11th Edition)
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Classical Mendelian Genetics, Incomplete Dominance, Codominance, and Multiple Alleles
1. Complete the table given below regarding the phenotype and genotype ratios in completely
dominant traits. R and r represent the dominant and recessive allele, respectively.
Type of Cross
rrx rr
RR x rr
Rrx rr
Rrx Rr
Genotype Ratio
Phenotype Ratio
RR x Rr
RR X RR
*How would the genotype ratios be affected if the mode o inheritance in incomplete dominance?
Codominance?
2. In dogs, barer trait is controlled by a dominant gene D and the silent trait by the recessive gene d.
Normal tail is dependent on a dominant gene M and the screw m. Give the probable genotypes of
the parents in the following crosses:
Phenotype of parents
Phenotypes of progeny
Genotypes of parents
Barker
Barker Silent
Silent
normal
screw
normal
normal
a. silent normal x silent normal
b. barker normal x silent normal
0
0
6
2
7
2
8
3
c. barker normal x silent screw
4
5
5
3
d. barker screw x silent normal
6
0
0
0
e. barker screw x silent screw
0
6
0
7
Transcribed Image Text:Classical Mendelian Genetics, Incomplete Dominance, Codominance, and Multiple Alleles 1. Complete the table given below regarding the phenotype and genotype ratios in completely dominant traits. R and r represent the dominant and recessive allele, respectively. Type of Cross rrx rr RR x rr Rrx rr Rrx Rr Genotype Ratio Phenotype Ratio RR x Rr RR X RR *How would the genotype ratios be affected if the mode o inheritance in incomplete dominance? Codominance? 2. In dogs, barer trait is controlled by a dominant gene D and the silent trait by the recessive gene d. Normal tail is dependent on a dominant gene M and the screw m. Give the probable genotypes of the parents in the following crosses: Phenotype of parents Phenotypes of progeny Genotypes of parents Barker Barker Silent Silent normal screw normal normal a. silent normal x silent normal b. barker normal x silent normal 0 0 6 2 7 2 8 3 c. barker normal x silent screw 4 5 5 3 d. barker screw x silent normal 6 0 0 0 e. barker screw x silent screw 0 6 0 7
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