Answered

Welcome to Westonci.ca, the place where your questions find answers from a community of knowledgeable experts. Get quick and reliable solutions to your questions from a community of seasoned experts on our user-friendly platform. Our platform offers a seamless experience for finding reliable answers from a network of knowledgeable professionals.

The offspring of a particular cross are 100 percent heterozygous for the trait of plant height. What were the most likely genotypes of the parents?

A. [tex] Tt \times tt [/tex]
B. [tex] Tt \times Tt [/tex]
C. [tex] tt \times tt [/tex]
D. [tex] TT \times tt [/tex]

Sagot :

GinnyAnswer
To determine the most likely genotypes of the parents that result in 100 percent heterozygous offspring for the trait of plant height, let's analyze each potential cross mentioned:

1. Cross: [tex]$Tt \times tt$[/tex]

- One parent is heterozygous ([tex]$Tt$[/tex]), and the other parent is homozygous recessive ([tex]$tt$[/tex]).
- The possible offspring from this cross would be:
- [tex]$Tt$[/tex] (from T from the first parent and t from the second parent)
- [tex]$tt$[/tex] (from t from both parents)
- The genotypes of the offspring: [tex]$Tt$[/tex] and [tex]$Tt$[/tex].
- Since all offspring (100%) are heterozygous ([tex]$Tt$[/tex]), this cross is a suitable candidate.

2. Cross: [tex]$Tt \times Tt$[/tex]

- Both parents are heterozygous ([tex]$Tt$[/tex]).
- The possible offspring from this cross would be:
- [tex]$TT$[/tex] (from T from both parents)
- [tex]$Tt$[/tex] (from T from one parent and t from the other parent)
- [tex]$Tt$[/tex] (from t from one parent and T from the other parent)
- [tex]$tt$[/tex] (from t from both parents)
- The genotypes of the offspring: [tex]$TT$[/tex], [tex]$Tt$[/tex], [tex]$Tt$[/tex], and [tex]$tt$[/tex].
- The ratio would be approximately 1:2:1 (25% [tex]$TT$[/tex], 50% [tex]$Tt$[/tex], 25% [tex]$tt$[/tex]), so not all offspring would be heterozygous. This cross cannot result in 100% heterozygous offspring.

3. Cross: [tex]$tt \times tt$[/tex]

- Both parents are homozygous recessive ([tex]$tt$[/tex]).
- The possible offspring from this cross would be:
- [tex]$tt$[/tex] (from t from both parents)
- The genotypes of the offspring: [tex]$tt$[/tex].
- Since all offspring (100%) are homozygous recessive, not heterozygous, this cross is incorrect for the given condition.

4. Cross: [tex]$\pi \times t t$[/tex]

- The genotype [tex]$\pi$[/tex] is not a valid genotype in genetics. This suggestion appears to be erroneous or unrelated to standard genetic notation.
- Thus, we can disregard this option.

From the analysis above, the cross that results in 100% heterozygous ([tex]$Tt$[/tex]) offspring is:

[tex]$Tt \times tt$[/tex].

Therefore, the most likely genotypes of the parents are:

[tex]\[ \boxed{Tt \times tt} \][/tex]
We appreciate your time. Please revisit us for more reliable answers to any questions you may have. We hope our answers were useful. Return anytime for more information and answers to any other questions you have. We're glad you chose Westonci.ca. Revisit us for updated answers from our knowledgeable team.