3. (Based on Ch. 4 #5) Budgie parakeets come in green, yellow, blue, and albino

Question

3. (Based on Ch. 4 #5) Budgie parakeets come in green, yellow, blue, and albino color forms, as a result of the actions of two pigment-producing genes, one Yellow and the other Blue. Green birds produce both pigments. For each gene, homozygous recessive genotypes result in no pigment production. If you were to cross a true-breeding blue parakeet with a true-breeding yellow parakeet, what genotypes and colors do you expect to see in the F1 generation offspring? Also give the expected fraction of individuals corresponding to each color form. What if you crossed an Fl individual with its yellow parent? Again give the resulting genotypes and the expected fraction of individuals corresponding to each color form.

Explanation / Answer

A true breeding yellow and a true breeding blue will both be homozygous for the two pigments-BB and YY. Hence the F1 would be a heterozygote of both genes -BY which will give green color. All the F1 will be heterozygotes and green.

A F1 cross to a yellow parent would be:

BY x YY

You would get -BY and YY in 50:50 ratio. Half would be green and half would be yellow.

Related Questions

Navigate

• Browse (All)
• Browse 3
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.