For this assignment, you will work through a series of questions about genes, chromosomes, and inheritance, using the (obviously fantastic) example of dragons. Some of the questions are multiple-choice, some are true/false, and some require a brief written explanation. (The ones requiring a written answer are each worth 3 points; the others are each worth 2.)
This assignment is set up as a “quiz,” but it’s really more like a worksheet. Take as long as you need to answer each question correctly before moving on to the next one — as long as you finish before the assignment is due, of course! (If you’re really confused, consult with your instructor! I won’t give you the correct answers, but I’ll do my best to help you to understand what you need to reach the right answers.)
Your final score will be available after I grade your written responses. The correct answers as well as explanations as to why they are correct are set to become visible to you on Tuesday, October 2nd. Especially if you miss any points — but even if you didn’t — remember to come back and see the answers and my comments, in which I attempt to make the reasoning as clear as possible.
HOW TO ANSWER THE QUESTIONS:
To answer the questions you’ll need to know some basic information about dragon genetics. This can be found on the chart below. It will appear at the top of the page for every question you are asked. After you submit an answer to a question, scroll down past the chart on the new page until you see the next question. If you’d rather download it to print out, click here.
Dragon genetics are very simple. Dragons have four autosomal chromosome pairs, and one sex chromosome pair (XX or XY). Each chromosome pair contains very few genes (at least very few we’ll worry about!). The chart below shows you which genes are on which chromosomes — each different letter represents a different gene (A, B, D, etc.). All the traits we’re looking at are simple Mendelian ones, meaning that there are (at most) two different alleles of the gene for the trait, one dominant (CAPITAL LETTER) and one recessive (lower case letter). The chart shows you what trait results from the dominant allele and what trait results from the recessive allele.
|CHROMOSOMES||GENES (DOMINANT ALLELES)||GENES (recessive alleles)|
|Autosome pair #1|| A – SHORT NECK
B – NO CHIN SPIKE
| a – long neck
b – chin spike
|Autosome pair #2|| D – FIRE BREATHER
E – NO SPOTS ON BODY
F – SHORT ARMS
| d – not a fire breather
e – spots on body
f – long arms
|Autosome pair #3|| G – NO TAIL SPIKE
H – CHEST PLATES
| g – tail spike
h – no chest plates
|Autosome pair #4|| I – NO WINGS
J – SPOTS ON LEGS
| i – wings
j – no spots on legs
|X Chromosomes|| M – RED COLORED DRAGON
N – COMB ON HEAD
| m – green colored dragon
n – no comb on head
|Y Chromosomes||P – SEX = MALE||(no alternate allele)|
- Here is a Visual representation of one induvial dragon’s chromosomes and the particular alleles it has for each gene. Each line is a chromosome and each letter represent an allele for the genes described in the general information on dragon genetics at the top of this assignment.
However, this representation cannot be right. Explain briefly but the enough detail to show your full understanding what is wrong with it?
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