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Mister Poppleton, a cat enthusiast who breeds cats and competes on...

Mister Poppleton, a cat enthusiast who breeds cats and competes on the Cat Fancier's Association competitive show circuit, has just received quite a shock! His award-winning cat, Emeline, has given birth to some surprising kittens. Of her five kittens, four have black fur, and one has an unexpected coat of fur that is a patchwork of black and orange, known as a tortoiseshell pattern.


Mister Poppleton was breeding Emeline with an award-winning male cat, named Barnaby, but he is now worried that Emeline may have been having secret sexual relations with a neighborhood stray cat, named Hugo. Mister Poppleton consults with his veterinarian, Dr. Doolittle, for some expert advice.


Dr. Doolittle explains: In cats, there are several genes that determine fur color. One of those genes is found on the X chromosome and codes for whether a cat has orange fur or black fur. Because it is a sex-linked gene, it is expressed a bit differently in males than in females.


In males:

• If a male cat has the orange allele on his X chromosome, he will have orange fur.

• If a male cat has the black allele on his X chromosome, he will have black fur.


In females:

• If a female cat has the orange allele on both of her X chromosomes, she will have orange fur.

• If a female cat has the black allele on both of her X chromosomes, she will have black fur.

• If a female cat has the orange allele on one of her X chromosomes and the black allele on the other X chromosome, she will have a tortoiseshell coat.


With this information in mind, Mister Poppleton takes a closer look at Emeline and the possible fathers (Barnaby and Hugo) of her kittens. Emeline is a female cat with all-black fur. Barnaby is a male cat with all-black fur. Hugo is a male cat with all-orange fur.


Who is the father of these kittens? (Note: All of the kittens have the same father.)


Barnaby or Hugo ?





2.How do you know this? Be sure to provide evidence from the scenario and from what you know about patterns of inheritance.


3.Why does only one kitten have the unusual tortoiseshell coat? Be sure to provide evidence from the scenario and what you know about patterns of inheritance.

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