Use the following chart to answer the question. The phenotype of the baby dragon

Question

Use the following chart to answer the question.

The phenotype of the baby dragon is that it has diamond and circular scales. What are the possible genotypes?

A) dd is the only possibility

B) DD is the only possibility

C) Dd is the only possibility

D) dd or Dd

DRAGON GENOME -DECODING THE GENES Chromosome Dominant alleles Recessive alleles W has wings L long neck and tail A normal skin pigment G skin color green* Green Autosome W no wingS 1 short neck and tail a completely white g skin color red* Yellow Autosome not fire breather B fire breather T and t [Incomplete Dominance-see below] D and d [Codominant-see below] b X Chromosome H has horn on nose h hornless Y chromosome M male sex (results in spike on tip of tail) Incompletely dominant alleles TT five-toed Tt four-toed tt three-toed Codominant alleles DD diamond scales Dd diamond & circular scales dd circular scales *If a dragon is aa and therefore unable to make skin pigment, it will have white skin no matter what alleles it has for the skin color gene

Explanation / Answer

The scales on the dragon are codominant genes where the heterozygote allele express both the phenotypes in equal amounts.

The baby dragon having both circular and diamond scales will have the genotype Dd as the one possibility.

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