____________ is two different alleles for a gene, while two identical alleles for a gene is __________.
1 answer:
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Answer:
See the answer below
Explanation:
Let the tallness be represented by T and the shortness by t.
True-breeding tall plant = TT
True-breeding short plant = tt
<em> TT x tt</em>
<em> Tt Tt Tt TT</em>
<u>Genotypic ratio of offspring</u>: 100% Tt
<u>Phenotypic ratio of offspring</u>: 100% tall (see the first attached image for the Punnet's square analysis)
(a)<em> See the second attached image for the Punnet's square analysis</em>.
<em> Tt x Tt</em>
<em> TT Tt Tt tt</em>
<u>Expected genotypes</u>
- 1/4 TT
- 1/2 Tt
- 1/4 tt
<u>Expected phenotypes</u>
- Tall - 75%
- Short - 25%
(b) <em> Tt x tt</em>
<em> Tt Tt tt tt</em>
<u>Expected genotypes</u>
- 1/2 Tt
- 1/2 tt
<u>Expected phenotypes</u>
- Tall - 50%
- Short - 50%
The kind of cross if referred to as<u> test crossing</u>.
(c) <em>Tt x TT</em>
<em> TT TT Tt Tt</em>
<u>Expected genotypes</u>
- 1/2 TT
- 1/2 Tt
<u>Expected phenotypes</u>
- Tall - 100%
