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In a diploid organism, if an individual has a phenotype for a trait that is dominant, what are the possible genotypes for the remaining chromosomes related to this trait?
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13. Mendelian Genetics
Genotype vs. Phenotype
Scelta multipla
If an organism exhibits a phenotype of blue flowers (b), what could be its possible genotype?
A
bb
B
Bb
C
bB
D
BB
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Understand the concept of phenotype and genotype: Phenotype refers to the observable traits of an organism, such as blue flowers, while genotype refers to the genetic makeup that determines these traits.
Identify the alleles involved: In this problem, the alleles are represented by 'B' and 'b'. 'B' is typically the dominant allele, and 'b' is the recessive allele.
Determine the relationship between alleles: A dominant allele (B) will mask the expression of a recessive allele (b) in a heterozygous genotype (Bb). Therefore, the presence of a dominant allele will result in the dominant phenotype.
Consider the possible genotypes: For an organism to exhibit the phenotype of blue flowers, which is recessive, it must have two recessive alleles. Therefore, the genotype must be 'bb'.
Review the options provided: The options given are Bb, bB, and BB. Since the phenotype is blue flowers, the correct genotype should be 'bb', which is not listed among the options. Therefore, there might be an error in the options provided.
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