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

Pergunta

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

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

Solução

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MiguelProfissional · Tutor por 6 anos

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To determine the likely genotypes of the parents, we need to understand the inheritance pattern of the trait in question. Since the offspring are 100 percent heterozygous for the trait of plant height, we can infer that the trait is controlled by a single gene with two alleles, where one allele is dominant (T) and the other is recessive (t).<br /><br />Given that all offspring are heterozygous (Tt), it suggests that each parent must have contributed one allele each. The possible combinations of parental genotypes that could result in 100 percent heterozygous offspring are:<br /><br />1. One parent is heterozygous (Tt) and the other is homozygous recessive (tt).<br />2. Both parents are heterozygous (Tt).<br /><br />Let's analyze each scenario:<br /><br />1. If one parent is Tt and the other is tt, the possible combinations of alleles in the offspring would be:<br /> - Tt (from Tt parent) and tt (from tt parent)<br /> - Tt (from Tt parent) and tt (from tt parent)<br /> - Tt (from Tt parent) and tt (from tt parent)<br /> - Tt (from Tt parent) and tt (from tt parent)<br /><br /> In this case, all offspring would be heterozygous (Tt), which matches the given condition.<br /><br />2. If both parents are Tt, the possible combinations of alleles in the offspring would be:<br /> - TT (from Tt parent) and Tt (from Tt parent)<br /> - Tt (from Tt parent) and Tt (from Tt parent)<br /> - tt (from Tt parent) and Tt (from Tt parent)<br /> - Tt (from Tt parent) and Tt (from Tt parent)<br /><br /> In this case, the offspring would be 25% homozygous dominant (TT), 50% heterozygous (Tt), and 25% homozygous recessive (tt), which does not match the given condition.<br /><br />Therefore, the likely genotypes of the parents are Tt and tt.
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