Flower color in a particular plant species is determined by one gene. The alleles of that gene can code for either red flowers or blue flowers. When two such plants are crossed, however, some of the offspring produce purple flowers. What is the genotype of the plants with purple flowers?

Question options:

An allele for red flowers on both homologous chromosomes.

Two alleles for red flowers on one homologous chromosome and two alleles for blue flowers on the other

An allele for red flowers on one homologous chromosome and an allele for blue flowers on the other

An alleles for purple flowers on both homologous chromosomes

Question

Biology

Gustavo Stevens

18 February, 20:21

Flower color in a particular plant species is determined by one gene. The alleles of that gene can code for either red flowers or blue flowers. When two such plants are crossed, however, some of the offspring produce purple flowers. What is the genotype of the plants with purple flowers?

Question options:

An allele for red flowers on both homologous chromosomes.

Two alleles for red flowers on one homologous chromosome and two alleles for blue flowers on the other

An allele for red flowers on one homologous chromosome and an allele for blue flowers on the other

An alleles for purple flowers on both homologous chromosomes

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Answers (1)

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Arias · Answer 1

An allele for red flowers on one homologous chromosome and an allele for blue flowers on the other

This is an example of codominance when neither of the alleles for the trait are completely dominant over the other. This means that both alleles express themselves producing a third phenotype. In this case, one homologous chromosome contains red allele whereas the other contains blue allele, resulting in production of purple flowers.