Feather Color in Budgies Is Determined by Two Different Genes

question 2

Multiple Choice

Feather color in budgies is determined by two different genes, Y for pigment on the outside of the feather, and B for pigment on the inside of the feather. YYBB, YyBB, or YYBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white. Two blue budgies were crossed. Over the years, they produced 22 offspring, five of which were white. What are the most likely genotypes for the two blue budgies?

• A) yyBB and yyBB
• B) yyBB and yyBb
• C) yyBb and yyBb
• D) yyBb and yybb

---

Definitions:

Vestibular System

Somatosensory system comprising a set of receptors in each inner ear that respond to body position and to movement of the head.

Inner Ear

The inner part of the ear that contains structures responsible for hearing and balance, including the cochlea and vestibular system.

Spinothalamic Tracts

Nerve pathways in the spinal cord that carry sensory information related to pain and temperature to the brain.

Ventrolateral

Relating to the front and side of a bodily structure, often used in reference to specific parts of the brain or the body.