# Feline colour genetics course – Module 1 exercise answers

Here are the questions and answers to all of the exercises found in module one: Basic genetics, Solid colour cats and the dilute gene.

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

Good luck!

### Exercise 1

M1.E1: Below are 4 cats each with their genotype written beside them. Based on what you have learned so far and from the details given in the genotype for each cat, see if you can work out what phenotype each would be and which colour (if any)each one carries…

Cat a) ooBB appears:_BLACK____________& carries:___NOTHING_________

Cat b) oobb1 appears:__CHOCOLATE____& carries:_____CINNAMON_______

Cat c) oobb appears:___CHOCOLATE____ & carries:___NOTHING___________

Cat d) OObb appears:___RED__________& carries____CHOCOLATE________

### Exercise 2

M1.E2: Below are two punnet squares which have had the parents alleles already filled in for you. See if you can fill in the results of the next two punnet squares for yourself and from your results determine the answers to some simple questions about the kittens.

You can either scribble a copy of the punnet square down onto some scrap paper to do this exercise or alternatively you can print off our free blank punnet square by clicking here and then fill in the information you need.

Punnet square a)

- Write down the different genotype/s that appeared in this litter?__BB__&__Bb______________________________________
- What phenotype were the kittens?__BLACK____________________________________
- What percentage of kittens were homozygous chocolate?____0%___________________
- What percentage of kittens were homozygous Black?____50%______________________

Punnet square b)

1) What genotype would the kittens be? (this time include percentage such as 50% bb and 50% BB as applicable to this punnet square)____100% bb________________

2) What phenotype would the kittens be?_CHOCOLATE______________________________

3) What percentage of kittens would be heterozygous for chocolate?__0%________________

4) What percentage of kittens carried black in their genotype?____0% (A CHOCOLATE CAT CAN NEVER CARRY BLACK______________

Well done on completing and reading your first punnet squares! Did you spot the trick question!!! 😉

In the above exercise we only covered black and chocolate to keep things easy. Now lets’ have a go at looking at adding the cinnamon mutation into the mix. We know cinnamon is recessive to chocolate and a cinnamon cat is written as ‘b1 b1’. Since cinnamon is recessive to both black and chocolate a cinnamon cat can never carry either black or chocolate.

### Exercise 3

M1.E3: Just like in exercise 2, see if you can fill in the punnet squares below and answer two simple questions about each one.

Punnet square a)

- What phenotype would the resulting kittens be?__CHOCOLATE_______________________
- How many kittens would be black?__NONE___________________________

Punnet square b)

- What percentage of kittens would be cinnamon?___0%________________________
- What percentage of kittens would carry cinnamon?___100%____________________

Punnet square c)

- What percentage of kittens would be heterozygous for chocolate?_25%_____________
- How many different phenotypes would we see in this litter of kittens?__3_(BLACK, CHOCOLATE AND CINNAMON)________________

### Exercise 4

Now onto some punnet squares which include the red gene…

M1.E4a: The punnet square below is already filled out for you in entirety. Both X and Y chromosomes have been included alongside the colour alleles so that you can clearly see how the colour of red correlates to the X chromosome. Using the completed punnet square, try to answer the two questions below.

- The punnet square tells us that we have a red male mated to a homozygous black female. What percentage of the kittens in the litter would be tortoiseshell?__50%____________.
- What colour would the female kittens be?_Black Tortoiseshell____________________.

M1.E4b: Below is another punnet square with the genotypes of the parents already filled in for you. Fill in the remainder of the punnet square and see if you can answer the questions that follow.

- What is the phenotype of the mother and father used in this punnet square? Mother:_BLACK TORTOISESHELL______Father:__RED____________________
- What percentage of kittens would be red? _50%__________________
- Some of the male kittens resulting from this mating would be red and some would be black. True or false? ____TRUE______
- From this mating, what percentage chance would a kitten have of being a red female?___25% CHANCE_____

### Exercise 5

M1.E5: Below are three questions for you to answer. Based on your knowledge of the dilute gene try to answer them correctly…

- If a blue cat is mated to a black cat that does not carry any other colours and does not carry dilute what will the genotype of the kittens be? If you wish to draw out a punnet square to help you with this you can__BBDd__________________________________________
- A Cream male and a chocolate female are mated together. What colour will the female kittens be?__CHOCOLATE TORTOISESHELL___________________________
- A Blue cat is a dilute version of which colour?_BLACK____________________________

NB. When working out dilute colours on punnet squares…If you prefer to work over two separate punnet squares for ease of reading when adding in the dilute gene you may certainly do that. You will still get the same results. 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 dilute alleles to determine what percentage of the kittens would be homozygous dilute and know that this dilute could apply to any of your kittens. If you know that black becomes blue, chocolate becomes lilac and cinnamon becomes fawn 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 27 points.

**If you scored between 0-7 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 foundation 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 8-15 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 2. The foundation is the most important part!

**If you scored between 15-22 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 2 so enjoy and well done! You did an excellent job!

**If you scored between 23-27 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!