Please could you help me with these questions: Hair length of the fur in cats can be either short or long. The allele for short hair is dominant to that of long hair, and is transmitted in normal Mendelian fashion. One of several genes involved with cat coat colour has two alleles, black and ginger, which are associated with sex-linkage on the X chromosome. Three types of phenotypes are seen in females, black, ginger, and tortoise shell (a mixture of ginger and black fur), whilst male cats only exhibit two fur colours with this gene, namely ginger or black. In cats females are the homogametic sex.
Please could you help me with these questions:
Hair length of the fur in cats can be either short or long. The allele for short hair is dominant to that of long hair, and is transmitted in normal Mendelian fashion.
One of several genes involved with cat coat colour has two alleles, black and ginger, which are associated with sex-linkage on the X chromosome. Three types of
c) State the type of relationship shown between the black allele and the ginger allele for the gene given in terms of cat fur colour, justifying your answer with the evidence from the question details given.
d) Produce a key to clearly show the nature of the genetics associated with the colour of cat fur for the gene given, and in each case justify your choice of letters and / or style of presentation to best depict the genetics involved.
e) A male black short furred cat mates with a ginger short furred female cat – without further information and using the information you have provided in your keys above, what are the possible genotypes of these two cats and why? (Hint: You need to show the genotypes as an expression of both genes together - and you need to explain the logic of how you have arrived at your answer).
f) The pair of cats produce in their first litter together the following kittens:
3 tortoiseshell short fur females, 2 tortoiseshell long fur females, 3 ginger short fur males, and 1 ginger long fur male.
From this information only (no genetic diagrams required), what evidence can you use to deduce the genetic identity of the parent cats?
g) Having identified the genetic identity of the parent cats, fully proof your answer to show the simultaneous transmission of the two genes involved with this family of cats, with the use of genetic diagrams and summaries as required. (Hint: you are only required to show the simultaneous transmission from the P to F1 generations)
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