1. Dragon Genetics
Practice Problems

2. In dragons, the allele for fire breathing is dominant
In dragons, the allele for fire breathing is dominant.  Dragons can be fire breathers, or non fire breathers.
Show the genotypes and phenotypes of all possible dragons.

3. If a heterozygous fire-breathing dragon is crossed with one that does not breathe fire, what proportion of their offspring will be fire breathers?

4. If two heterozygous dragons are crossed, what proportion of their offspring would you expect to NOT be fire-breathers?

5. Also in dragons, wings are a dominant trait
Also in dragons, wings are a dominant trait.  If you crossed two wingless dragons,what proportion of their offspring would you expect to have wings?

6. Two winged dragons produce an offspring that does not have wings
Two winged dragons produce an offspring that does not have wings.  What are the genotypes of the parents?

7. If a purebred winged dragon is crossed with a purebred wingless dragon, what proportion of their offspring will be winged and what is their genotype?

8. A dragon with wings (Dd) is crossed with ones that does not have wings
A dragon with wings (Dd) is crossed with ones that does not have wings. What percentage of their offspring will be wingless?

9. Dragons also come in a mini (dwarf) variety
Dragons also come in a mini (dwarf) variety. Dragon dwarfism is caused by a dominant allele. Show the genotypes and phenotypes possible for dragons with regard to size.

10. Show the cross between a double dominant mini-dragon to one that is normal sized.
What percentage of their offspring will be mini-dragons?

11. The farmer realizes he could sell mini-dragons as pets, but doesn’t want them to breathe fire, because that would be dangerous. Suggest two parental genotypes for parents that would produce mini, non-fire breathing dragons.

12. What are the chances that two heterozygous mini dragons will produce normal sized offspring?

13. Dragon Genetics - Level 2
Dwarf DD
Dwarf Dd
Normal dd
Fire FF
Fire Ff
No Fire ff
Set up a punnett square (or squares) to show the following cross:
ddff x DDFf
What proportion of the offspring will be dwarfs, but cannot breathe fire?

14. How many offspring in the following cross will be normal sized, fire breathers?
DdFF x Ddff

15. A wingless (gg) dragon that can breath fire (Ff) is crossed with one that has wings (Gg) and cannot breath fire (ff). How many of their offspring will be fire breathing and winged?

16. Dragons can come in multiple colors, though the most common colors are green and gold. The allele for these colors is CODOMINANT. A heterozygous dragon will have green and gold scales.
Show all the genotypes and phenotypes possible.

17. A green dragon is crossed with one that is green and gold
A green dragon is crossed with one that is green and gold. What proportion of its offspring will be green?
If two green-gold dragons are crossed, what percentage of their offspring will be solid green?

18. A wingless green-gold dragon is crossed with one that does have wings and is solid gold. Set up the cross and determine how many of their offspring will be solid gold and have wings.