1. Long hair is dominant, short hair is recessive. Rex, a dog with long hair, falls madly in love with Rexie, a girl dog with short hair. Rex’s genes are heterozygous for long hair (Ll) and Rexie’s genes are homozygous recessive for short



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AIRY GENETICS
1. Long hair is dominant, short hair is recessive.

Rex, a dog with long hair, falls madly in love with Rexie, a girl dog with short hair. Rex’s genes are heterozygous for long hair (Ll) and Rexie’s genes are homozygous recessive for short hair(ll). What are the phenotypes and genotypes of their puppies?


2. Bushy eyebrows are dominant, fine eyebrows are recessive.

Gregor is homozygous dominant for bushy eyebrows (BB). He marries Gertrude, who is homozygous recessive for thin eyebrows(bb). What are the chances their only child Gregor Junior will have bushy eyebrows like his dad?


3. Gregor Junior meets Gladys, who has attractive, thick bushy eyebrows and it’s love at first sight. Gladys is heterozygous bushy. What will the phenotypes and genotypes of their children be?
4. Gladys also happens to have a very fashionable unibrow. (Non-unibrow is dominant, a unibrow is recessive). She plucks it, of course, but her eyebrows are so amazingly bushy that the hair grows back in a few hours. She is homozygous recessive for a unibrow, but her very attractive husband is heterozygous for a unibrow, and doesn’t have one. Use whatever letter seems to make the most sense to you on this one, and write down what the children’s fate will be! Will they have unibrows? If so, how many, and what are all their genotypes?
5. Gilbert, one of their kids with heterozygous bushy eyebrows and a unibrow also happens to be heterozygous for non-hairy ears. (No hair on the ears is dominant, hairy ears are recessive) He falls head over heels for a woman named Georgette, who is a striking beauty despite the fact that she has incredibly hairy ears (she covers them with her hair). She is homozygous recessive for hairy ears. What are the phenotypes and genotypes of their children George, Georgina, Georgio, and Georgie?
6. Gandalf falls in love and marries Gloria, who suffers from horrible back hair. She has the recessive gene that codes for back hair. They want to know if their kids will have back hair – so they come to you. They tell you that Gandalf’s mom has back hair, but not Gandalf’s dad, and neither of Gloria’s parents had back hair, but her grandma did.

According to this information –

A: what are the genotypes of Gandalf and Gloria, and

B: if they have four kids, what are the chances the kids will end up with back hair?



7. Geraldo marries Geraldine. Geraldine’s mom had super nose hair, but her dad didn’t. Geraldo’s parents both don’t have super nose hair. Both Geraldo and Geraldine don’t have super nose hair. Their first baby was born with nose hair over a foot long. How is this possible?
Grandma YES Grandpa NO Grandma NO Grandpa NO

Geraldine NO Geraldo NO



Baby YES

8. Toe and knuckle hair is kind of nice when the weather is cold. It’s also a dominant gene. So when both of their kids weren’t born with toe and knuckle hair, Greta and Geronimo were upset and puzzled. Since both of the parents had toe and knuckle hair, they thought their kids would have the gift of hair as well. How is it possible for their two kids to not have this trait? Use the words “chance” or “probability” in your answer.


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