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Tt xx tt is...

Tt `xx` tt is

A

Test cross

B

Back cross

C

Hybridisation

D

Reciprocal cross

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Genotypes**: - The given genotypes are Tt (heterozygous) and tt (homozygous recessive). - T represents the dominant allele, while t represents the recessive allele. 2. **Identifying the Cross**: - The cross involves Tt (dominant phenotype) with tt (recessive phenotype). - This type of cross is known as a **test cross** because it helps determine the genotype of the dominant phenotype by crossing it with a homozygous recessive individual. 3. **Setting Up the Punnett Square**: - To visualize the potential offspring, we can set up a Punnett square. - The alleles from Tt will be T and t, while the alleles from tt will both be t. | | t | t | |-----|-----|-----| | T | Tt | Tt | | t | tt | tt | 4. **Analyzing the Results**: - From the Punnett square, we can see the possible genotypes of the offspring: - 50% Tt (heterozygous, dominant phenotype) - 50% tt (homozygous recessive, recessive phenotype) 5. **Conclusion**: - The correct answer to the question is that the cross Tt x tt is a **test cross**. This method is used to determine the genotype of an organism with a dominant phenotype by crossing it with a homozygous recessive individual.
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