Question

In a genetics laboratory, two heterozygous tall plants are crossed. If tall is dominant over short, what are the expected phenotypic results?

Answer 1

The expected phenotype it 75% tall. Since they are both heterozygous, there is a 25% chance that the phenotype would be short. 
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Answer 2

If tall is dominant over short, then it is expected to observe tall-short plants in a proportion 3:1.

• Alleles can be defined as different gene variants which are inherited in pairs in diploid individuals.

• A homo-zygous individual contains the same alleles for a given gene, whereas a heterozygous individual has two different alleles.

• In complete dominance, the dominant allele masks the expression of the recessive allele in heterozygous individuals.

In conclusion, if tall is dominant over short, then it is expected to observe tall-short plants in a proportion 3:1.

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