Question

additional details were added for this assignment.
suppose a true - breeding blue flower is crossed with a true - breeding yellow flower. in the next generation, all of the flowers are blue.
what does this outcome tell you about the allele for blue flowers?
the blue allele is dominant to the yellow allele.
the blue allele is sex - linked.
the blue allele shows incomplete dominance.
the blue allele is recessive to the yellow allele.

Explanation:

In Mendelian genetics, when a true - breeding (homozygous) individual with one trait (blue flowers) is crossed with a true - breeding individual with another trait (yellow flowers), and all the offspring (\(F_1\) generation) show the trait of one parent. If the \(F_1\) generation all have blue flowers, it follows the principle of dominance. The allele that is expressed in the heterozygous \(F_1\) generation is the dominant allele.

• For sex - linked alleles, there would be a difference in inheritance patterns depending on the sex of the parent (not indicated here).
• In incomplete dominance, the \(F_1\) generation would show an intermediate phenotype (not all blue).
• If the blue allele were recessive, the \(F_1\) generation (heterozygous) would show the yellow (dominant) phenotype.

Answer:

The blue allele is dominant to the yellow allele.