Module 2 exercise answers – Free feline colour genetics course

Feline colour genetics course – Module 2 exercise answers

 

Here are the questions and answers to all of the exercises found in module two: All about white cats, Bi-colour cats and the genes responsible for them.

Mark down how many you got right and check your scores at the end.

Good luck!

 

Exercise 1

M2.E1 a)

  1. If a red eyed albino cat and a black cat that was homozygous for the dilution gene mated what colour would the kittens be?_Black________________________________________________
  2. Using the mating described in the previous question, what (if any) recessive genes would the kittens carry and what percentage of kittens in the litter would carry them?_100% would carry dilute and 100% would carry albino cc______________________
  3. The phenotype of a heterozygous albino(Cc) would be albino True or False? ___False______
  4. Does the albino gene mask colour or remove the colour of the cat?__Removes colour_

 

 

M2.E1 b) Fill in the punnet square below and answer three questions below…

  1. What percentage of kittens were albino?__50%____________________________________
  2. What colour were the kittens which were not albino?__Chocolate_____________________
  3. What percentage of albino kittens were likely to be male______50%____________________

 

 

Exercise 2

M2.E2 a) What is the correct term for odd eyes?____Heterochromia__________________________________

M2.E2 b) Fill in the punnet square below for the following mating: D heterozygous dominant white male who is chocolate carrying cinnamon and a female who is chocolate carrying cinnamon.

  1. What colours would you potentially see in the litter?_________________________________
  2. What percentage of kittens would be white?_________________________________________

 

Exercise 3

M2.E3 Dominant white cats are always deaf: true or false? __False________________________

 

Exercise 4

M2.E4 If you have a solid white cat in front of you and you do not know what its parentage is – aside from genetic testing and taking into consideration eye colour – can you think of another reliable way that is as reliable as genetic testing in which you would be able to deduce if the cat is a grade 10 white spotting cat or a dominant white cat?___Breed it to a cat without any white present and see the resulting kittens – if solid white kittens are born and have either blue or odd eyes then it is highly likely that it is a dominant white cat and if kittens are born with patches of colour/white then it is a grade 10 white spotting cat_____________________________

 

Exercise 5

M2.E5 a) Using what you have learned about cat genetics so far can you identify the most likely pair of parents for each of the kittens pictured below? For this exercise we shall assume that none of the parents are carriers and so we are basing our answers purely on the phenotype of the parents. This is to enable you to begin to really get to grips with what colours are recessive and which ones are dominant and to enable you to begin developing and eye for what may show up in a litter even with white thrown into the mix.

i)Albino = pair f.

As we know, albino is a recessive gene and needs two copies to be present for the cat to have this phenotype. Although two cats of any colour could also have an albino kitten in their litter if they were a carrier, we were not including any carriers in this exercise. This means that the only possible combination of parents has to be parent couple f.

 

ii)Blue and white =pair d

We know that white spotting gene is semi dominant and so only one parent needs to exhibit white spotting for a white spotting kitten to be born. We also know that both fawn and blue are dilute colours so we know that all the kittens would be a dilute colour. When we look back to what we learned in our first module we know that black is dominant over cinnamon and since blue and fawn are genetically black and cinnamon cats which are also homozygous for the dilution gene, this kitten would have easily been born to these parents.

iii)Dominant white = Pair a:

Or pair c:

Dominant white as we know masks all other colours and that at least one parent must be dominant white to pass on this trait. Since dominant white masks the other colours the other parent could be any combination what so ever so long as one parent was dominant white. The only parent couples with a dominant white parent present were pair a & pair c so our dominant white kitten could have been from either of these two matings.

 

M2.E5 b) Below are pictures of white cats with various coloured eyes. Each pair of eyes belongs to a pure white cat of unknown genotype. Try to answer the questions using the illustration and what you have just learned to help you figure out the answers.

  1. Of the cats eyes above which one/s would be highly likely to be deaf on both ears? ___B___
  2. Of the cats eyes above which cat/s would be highly likely to be deaf on one side?___ D________(D is most likely a dominant white cat which means it will likely be deaf on the blue eyed side. )A is most likely to be a grade 10 white spotting cat though there is still a chance it could be dominant white. If it is a grade 10 white spotting cat as is most likely the case it is not as likely to be deaf on the blue eyed side.)
  3. Looking at the cats eyes in the picture, how many cats are highly likely to be dominant white cats?___3_____(B,D & H – the remainder with the exception of G & F are more likely to be grade 10 white spotting cats rather than dominant white though only genetic testing would let you know this for sure)
  4. How many cats are albino? ____2___(G – red eyed albino & F – blue eyed albino)__

 NB. When working out dominant white on punnet squares…If you prefer to work over two separate punnet squares for ease of reading when adding in the dominant white gene you may certainly do that. You will still get the same results. As for dilute, you would simply fill out the colour in one punnet square and work out your results to determine what colour your kittens would be. You would then fill out a separate punnet square for the dominant alleles to determine what percentage of the kittens would be dominant white and know that this trait could apply to any of your kittens. If you know that dominant white masks all other colours but those dominant white cats will still be a particular colour it can help you predict future matings from that cat and you will always be able to work out what colours you might end up with in any given litter.

How did you do? Each correct answer is worth 1 point. The highest possible marks you could achieve for this module were 20 points.

 

If you scored between 0-5 points

It seems like you have struggled with this one. Don’t worry or feel bad. Re-visit the bits you struggled on and if you are still having a hard time, don’t give up…just leave us a comment in the box below the module or this answers sheet and as soon as we can we shall reply and help you get to grips with it. You will get there! Sometimes it just takes time to grasp the basic foundation which is the hardest bit to get! Once you get this then the rest will be easy peasy! Get this module under your belt before moving onto the other modules though as a good foundation is important for building to the higher levels of knowledge:-)

If you scored between 6-10 points

It would be a good idea to look at the questions you got wrong and revisit the section/s of the course that apply to those topics. Don’t worry, sometimes it can take a little getting used to when you are first trying to get your head round genetics. Keep going and if you get stuck leave a comment and we’ll help you out as soon as we can:-) Well done for all you have achieved so far, with a little more practice you will be great! It would be a good idea to work on building your score on this module first before venturing to module 3.

If you scored between 11-15 points

You scored a purrrfectly good score and have a good understanding of the basics of genetics, solid colour cats and the dilute gene. You are ready to enjoy learning about the new topics covered in module 3 so enjoy and well done! You did an excellent job!

 

If you scored between 16-20 points…

You are the cats whiskers!! Top of the class! Well done!!! You have developed a great level of knowledge in the basics of genetics, solid colour cats and the dilute gene. You are definitely ready to tackle the next module and build your knowledge to an even higher level. Congratulations on a job well done!