Multiple Choice
Which best describes genotype and phenotype, respectively?
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13. Mendelian Genetics
Genotype vs. Phenotype
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In a certain plant, the alleles A, B, and C are completely dominant to the alleles a, b, and c. A plant with the genotype AABbcc will have the same phenotype as a plant with the genotype __________.
A
Aabbcc
B
aabbcc
C
AABBCc
D
None of the listed responses is correct.
E
AaBBcc
Verified step by step guidance1
Understand that in genetics, a dominant allele will mask the presence of a recessive allele in the phenotype. This means that if a dominant allele is present, it will determine the trait expressed.
Identify the genotype of the first plant: AABbcc. Here, 'A' and 'B' are dominant alleles, while 'c' is a recessive allele. The phenotype will be determined by the presence of the dominant alleles 'A' and 'B'.
Recognize that the phenotype of the plant with genotype AABbcc is determined by the presence of at least one 'A' allele and one 'B' allele, regardless of the 'c' alleles, because 'C' is not present in this genotype.
To find a genotype that results in the same phenotype, look for a combination that includes at least one 'A' allele and one 'B' allele, while the 'c' alleles can be either 'C' or 'c' since they are recessive and do not affect the phenotype in the presence of 'A' and 'B'.
The genotype AaBBcc has at least one 'A' allele and two 'B' alleles, which will produce the same phenotype as AABbcc, as the presence of dominant alleles 'A' and 'B' determines the phenotype.
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