More genetics problems
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MORE GENETICS PROBLEMS. Dragons either have forked tongues or they do not. It is a trait determined by

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More genetics problems

Dragons either have forked tongues or they do not. It is a trait determined by

a pair of genes in each dragon (use F and f as genes). If dragons with forked tongues mate the offspring always have forked tongues. If a dragon without a forked tongue that was homozygous for the trait mated with a forked tongue dragon what would be the phenotypic ratio of their offspring?

What would be the genotypic ratios if one of the previous dragon offspring mated

with this one?

If the dragon above had offspring with forked tongues could both of the above

dragon’s parents NOT have forked tongues? Could its mate NOT have a forked


Suppose you run a dragon ranch in Rhode Island (Houston metro is bigger than

the entire state!) with plenty of dragons having both kinds of tongue. How could

you determine whether or not your prize male dragon without a forked tongue is



Some dragons have horns as a dominant trait (use H for the dominant gene)

and others are hornless (use h for the recessive gene).



If a hornless dragon WITHOUT a forked tongue mates with a horned forked-

tongue dragon and they can produce ONLY some offspring that are horned

with forked tongues and some that are hornless WITHOUT forked tongues

what are the genotypes of the parents?

What would be the genotypic and phenotypic ratios for a cross between the two

kinds of offspring from the preceding slide?

If a horned dragon without a forked tongue that had a parent with a forked tongue and

another parent without horns mates with a horned forked-tongue dragon and they have a

hornless offspring without a forked tongue what are the most probable genotypes of

all the dragons mentioned here?

Red-eyed dragons always produce offspring with red eyes and white-eyed dragons

always produce offspring with white eyes BUT a red-eyed dragon and a white-eyed

dragon will always produce offspring with pink eyes. What would be the genotypic

and phenotypic ratios for the offspring of a red-eyed dragon and a pink-eyed dragon?

If a pink-eyed hornless dragon mates with a red-eyed horned dragon that had a

hornless parent what would the genotypic and phenotypic ratios of their possible

offspring be?

Dragons have only four colors to their skin (Epidermis): red, black, red-black, and

yellow. Skin color results from a gene locus with three possible alleles: ER, EB, and

ER and EB are both dominant to e but not to each other. Yellow skin results from

a homozygous recessive genotype and red-black skin results from genotypes

heterozygous with ER and EB. If a red dragon and a black dragon produce a yellow

dragon what are all their genotypes? What other colors would be possible for

the yellow dragon’s siblings?

If a red female dragon produced a yellow child what color male dragons could

NOT be the father?

A red-black pink-eyed dragon and a yellow white-eyed dragon produce children.

What would be the expected phenotypic and genotypic ratios of those offspring?

Most dragons breathe fire but some cannot, and these latter are mostly males. Needless to say, this puts a real crimp in their ability to destroy villages and what not! Lack of

fire-breathing is sex-linked (F=fire and f=no fire). If a fire-breathing male and a fire-breathing female that had a father that could not breathe fire (How did he ever find a fire-breathing mate?!) produce offspring what kinds could they produce?