QQuestionBiology
QuestionBiology
Which of these genotypes are heterozygous?
A. TT
B. Tt
C. tt
D. None of these
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Answer
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Step 1:I'll solve this genetics problem step by step:
Step 2:: Understanding Genotype Notation
- In genetic notation, uppercase and lowercase letters represent different alleles of a gene - Uppercase (T) typically represents a dominant allele - Lowercase (t) typically represents a recessive allele
Step 3:: Defining Heterozygous
- A heterozygous genotype contains two different alleles - This means one dominant and one recessive allele are present - Represented by a mixed case notation like Tt
Step 4:: Analyzing Each Genotype
C. $$tt$$:
- This is a homozygous dominant genotype - Contains two dominant alleles - NOT heterozygous - This is a heterozygous genotype - Contains one dominant (T) and one recessive (t) allele - MEETS the definition of heterozygous - This is a homozygous recessive genotype - Contains two recessive alleles - NOT heterozygous
Step 5:: Identifying the Correct Answer
- Only $$Tt$$ is heterozygous
Final Answer
Tt is the only heterozygous genotype in this list.
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