Question

1. use the diagram below to answer the question

the diagram shows structures that help determine the color of a certain flower. which list best identifies the structures labeled x, y, and z in the diagram?
genetic information controlling flower color
diagram of homologous pair of z, with locus for flower color y, x for purple flowers (right chromosome) and x for white flowers (left chromosome)
a
x: allele
y: flower color gene
z: chromosome
b
x: gene
y: flower color allele
z: chromosome
c
x: allele
y: flower color chromosome
z: strand of dna
d
x: gene
y: flower color allele
z: strand of dna

Explanation:

1. Analyze X: X represents a variant of the flower color - determining factor, which is an allele (since alleles are different forms of a gene, and here X is for purple/white flower color variants).
2. Analyze Y: Y is labeled as "locus for flower color Y", and a gene is a segment of DNA that codes for a trait (flower color here), so Y is the flower color gene.
3. Analyze Z: Z is a pair of homologous structures, and chromosomes are the structures that carry genes, so Z is a chromosome.

• Option A: X is allele (correct), Y is flower color gene (correct), Z is chromosome (correct).
• Option B: X is gene? No, X is an allele (variant of gene), so B is wrong.
• Option C: X is allele (correct), but Y is flower color chromosome? No, Y is the gene, so C is wrong.
• Option D: X is gene? No, X is allele, and Z is strand of DNA? No, Z is chromosome, so D is wrong.

Answer:

A. X: allele, Y: flower color gene, Z: chromosome