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If a heterozygous tall palnt is crossed with a homozygous dwarf palnt, the proportion of dwarf progeny will:-
- a)50%
- b)75%
- c)100%
- d)25%
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
If a heterozygous tall palnt is crossed with a homozygous dwarf palnt,...
A) 50%
Explanation:
A heterozygous tall plant has the genotype Tt (T for the tall allele and t for the dwarf allele). A homozygous dwarf plant has the genotype tt. When these two plants are crossed, the possible genotypes of the progeny can be determined using a Punnett square.
Tt (heterozygous tall plant)
T | t
---------
t | Tt | tt
t | Tt | tt
As we can see, there are 4 possible outcomes: 2 Tt (tall) and 2 tt (dwarf). So, the proportion of dwarf progeny (tt) is 2 out of the 4 possibilities, which is equal to 50%.
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Explanation:
A heterozygous tall plant has the genotype Tt (T for the tall allele and t for the dwarf allele). A homozygous dwarf plant has the genotype tt. When these two plants are crossed, the possible genotypes of the progeny can be determined using a Punnett square.
Tt (heterozygous tall plant)
T | t
---------
t | Tt | tt
t | Tt | tt
As we can see, there are 4 possible outcomes: 2 Tt (tall) and 2 tt (dwarf). So, the proportion of dwarf progeny (tt) is 2 out of the 4 possibilities, which is equal to 50%.
Most Upvoted Answer
If a heterozygous tall palnt is crossed with a homozygous dwarf palnt,...
The answer is 50% (option a).
This is because the tall plant is heterozygous, meaning it has one dominant allele for height (T) and one recessive allele for dwarfism (t). The homozygous dwarf plant, on the other hand, has two recessive alleles for dwarfism (tt).
When these two plants are crossed, their offspring will inherit one allele from each parent. The possible combinations are:
- Tt (tall)
- tt (dwarf)
So, out of the total progeny, half will inherit the recessive allele from the heterozygous parent and will be dwarf (tt), while the other half will inherit the dominant allele and will be tall (Tt).
Therefore, the proportion of dwarf progeny will be 50%.
This is because the tall plant is heterozygous, meaning it has one dominant allele for height (T) and one recessive allele for dwarfism (t). The homozygous dwarf plant, on the other hand, has two recessive alleles for dwarfism (tt).
When these two plants are crossed, their offspring will inherit one allele from each parent. The possible combinations are:
- Tt (tall)
- tt (dwarf)
So, out of the total progeny, half will inherit the recessive allele from the heterozygous parent and will be dwarf (tt), while the other half will inherit the dominant allele and will be tall (Tt).
Therefore, the proportion of dwarf progeny will be 50%.
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Community Answer
If a heterozygous tall palnt is crossed with a homozygous dwarf palnt,...
Understanding the Genetics of Plant Height
In this scenario, we are examining the inheritance of tall and dwarf plants.
Key Terms:
- Heterozygous Tall Plant: This plant has one allele for tallness (T) and one for dwarfness (t). Its genotype is Tt.
- Homozygous Dwarf Plant: This plant has two alleles for dwarfness (t). Its genotype is tt.
Crossing the Plants:
When a heterozygous tall plant (Tt) is crossed with a homozygous dwarf plant (tt), we can predict the offspring using a Punnett square:
- The alleles from the tall parent (Tt) are T and t.
- The alleles from the dwarf parent (tt) are t and t.
Punnett Square Results:
| | t | t |
|-------|-------|-------|
| T | Tt | Tt |
| t | tt | tt |
Offspring Genotypes:
From the Punnett square, we see the following genotypes in the offspring:
- 2 Tt (Tall)
- 2 tt (Dwarf)
Proportion of Dwarf Progeny:
To calculate the proportion of dwarf progeny:
- Total Offspring = 4 (2 Tt + 2 tt)
- Dwarf Offspring = 2 (tt)
Thus, the proportion of dwarf progeny is:
- Dwarf Progeny Proportion = 2/4 = 50%
Conclusion:
Therefore, when a heterozygous tall plant is crossed with a homozygous dwarf plant, the proportion of dwarf progeny will be 50%. Hence, the correct answer is option 'A'.
In this scenario, we are examining the inheritance of tall and dwarf plants.
Key Terms:
- Heterozygous Tall Plant: This plant has one allele for tallness (T) and one for dwarfness (t). Its genotype is Tt.
- Homozygous Dwarf Plant: This plant has two alleles for dwarfness (t). Its genotype is tt.
Crossing the Plants:
When a heterozygous tall plant (Tt) is crossed with a homozygous dwarf plant (tt), we can predict the offspring using a Punnett square:
- The alleles from the tall parent (Tt) are T and t.
- The alleles from the dwarf parent (tt) are t and t.
Punnett Square Results:
| | t | t |
|-------|-------|-------|
| T | Tt | Tt |
| t | tt | tt |
Offspring Genotypes:
From the Punnett square, we see the following genotypes in the offspring:
- 2 Tt (Tall)
- 2 tt (Dwarf)
Proportion of Dwarf Progeny:
To calculate the proportion of dwarf progeny:
- Total Offspring = 4 (2 Tt + 2 tt)
- Dwarf Offspring = 2 (tt)
Thus, the proportion of dwarf progeny is:
- Dwarf Progeny Proportion = 2/4 = 50%
Conclusion:
Therefore, when a heterozygous tall plant is crossed with a homozygous dwarf plant, the proportion of dwarf progeny will be 50%. Hence, the correct answer is option 'A'.
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