Lilgoths, a Furry Reptile with Temperature Dependent Sex-Determination - Science Assignment Help

Assignment Task:

Task:

You'll be using this information for most of the questions. You are studying Lilgoths, a furry reptile with temperature dependent sex-determination. A few different traits have been studied in Lilgoths, but there is still much to uncover. ShapeLilgoths come in three shapes, viewed from above they can be circular, oval, or diamond shaped. You have been able to establish true breeding lines in your breeding facility and, in the wild, you've observed the following parental and offspring phenotypes (note: in the wild means you do not know if they are true breeding or not):
• circle X circle, giving all circle offspring
• circle X oval, giving all circle offspring
• oval X oval, giving all oval offspring
• circle X circle, giving circle, diamond and oval offspring
• diamond X diamond, giving all diamond offspring
• diamond X diamond, giving all circle offspring
Remember, this is just what you were able to observe, there may be other parent/offspring phenotypes Body fur colour

Lilgoths are covered in dense fur (body fur), and most Lilgoths have a large circular area on their back (spot) which is a different colour than their body fur. Body fur comes in five colours: grey, brown, black, light blue, and dark blue. Dark blue fur never breeds true (you can't have a dark blue true breeding line) but you've been able to establish true breeding lines for all the other fur colours. When you perform crosses with true breeding lines you see the following offspring phenotypes:
• Parents: grey X brown; offspring are all brown
• Parents: grey X black; offspring are all grey

• Parents: grey X light blue; offspring are all grey
• Parents: brown X black; offspring are all brown
• Parents: brown X light blue; offspring are all brown
• Parents: black X light blue; offspring are dark blue Spot colour
The spot (circular area on the back of lilgoths) is usually teal (wild type), but you've established true breeding mutant lines of red, green, and purple spots. When the true breeding lines are crossed you get the following results:
• Parents: teal X purple; offspring are all teal
• Parents: teal X green; offspring are all teal
• Parents: teal X red; offspring are all teal
• Parents: purple X green; offspring are all teal
• Parents: purple X red; offspring are all reddish-purple
• Parents: green X red; offspring are all teal Spotless
There is a rare mutation that makes Lilgoths spotless (they will still have body fur but no spot). From your studies you've been able to determine that spotless is an autosomal recessive trait with 70% penetrance. Horns
About 80% of female Lilgoths have horns. Horns are never seen in males.

Question 1
A competing lab recently presented work suggesting Lilgoth body shape was controlled by one gene they named Shape, with circle (Sc) and oval (So) showing incomplete dominance (diamondis ScSo). The number of crosses and offspring they observed was very low; you have a far largermating population and set out to test their hypothesis.
You breed a true breeding circle shaped Lilgoth with a true breeding oval shaped Lilgoth, and all of their offspring are circular. You then intercross the circular offspring and get the following:
• 25 circle
• 18 diamond
• 2 oval
Use a chi-square test to determine whether the results of your breeding experiments support your competitor's hypothesis.

In your answer, state whether your results support or do not support your competitor. Give the chi-square value, degrees of freedom, and p-value (as close as you can get; this will depend on the table you use). For full marks you must show your work. 3 marks

Note: Significance is p < 0.05. You can find a p-value table in this article here, though you are

welcome to use any table but make sure if using one you found on your own that it is a chi- square table.

Question 2
Given what you know, what is the relationship between the different fur colours?
Grey is to brown
Grey is to black
Grey is to light blue
Brown is to black
Brown is light blue
Black is light blue

Question 3
Given the information you have on spot colour, what is the minimum number of genes involved in spot colour? Explain your answer

Question 4
You've discovered a new spot colour mutant within your captive breeding population. Your new mutant, orange, is dominant to the wild-type teal. After much investigation you've also determined that orange is recessive lethal.
Is it possible to have an orange true-breeding line? Explain your answer (2 marks) Answers must be in fractions!
A) chance?
B) chance?
Show work

Question 5
You've crossed a black furred lilgoth with an orange spot to a dark blue lilgoth with an orange spot.
A) What are the chances that their offspring will have a teal spot and black fur?
B) What are the chances that their offspring will have an orange spot and black fur? For full marks you must show your work (you can combine work for A and B, if you wish).
(4 marks)
Give probabilities as fractions!
Give probabilities as fractions!
A) Chance?
B) Chance?

Question 6
You have been able to observe an extended family of Lilgoths in the wild for several generations. This family contains a few rare spotless individuals. When you first stumbled upon the spotted male (A) and the spotless female (B) pair they had their three offspring with them. Of the two male offspring, one was spotted (C) and one was spotless (D). Their female child was spotted (E).

The next year you saw the spotted female child (E), now grown with their mate a spotted male (Z). Both of their children (one male (F) and one female (G)) had spots. This year you saw the spotted male child (C), now grown with a spotless female mate (Y). They have an egg nest but the egg has not hatched yet.
Show work

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