Biology lab homework
Dragon Genes
http://www.concord.org/stem-resources/modern-genetics
BLY 121L - Take HomeAssignment
Due: Start of class time âAt thestart of class next week
Answers MUST beâ¦
⢠typed (no smaller than 11-pointfont)
⢠complete sentences (i.e., grammaticallycorrect â AND spell check!)
⢠THIS IS NOT AGROUP EFFORT â NO POINTS WILL BE AWARDED, IF YOUR PAPER ISSIMILAR IN CONTENT AND WORDING TO THAT OF YOURPEERâS.
Complete ALL4 modules:
1. Intro& Rules
2. Meiosis
3. Pedigree andGenes
4. The PlatesProblem
Complete and answer all of the questions fromeach module.
Introduction
Breed dragons to yield several offspring anddevelop a chart for all of the phenotypic characteristics youobserve.
⢠Note the genotype and dominant/recessivecondition for each trait.
⢠When you reach this section of theexercise, be sure to change the genotype for all traits to completethe chart.
Whatare the traits exhibited by yourdragons?
**YOUMUST TURN IN YOURCOMPLETED CHART AND IT MUST BE LEGIBLE!
Rules
Dominance and Recessive Traits
What isthe chromosome number(ânâ) for thedragons?
Which trait(s)exhibit incompletedominance?
What does it mean fora trait to be incompletely dominant?
Noallelic combination is described as being heterozygousrecessive. Why do you thinkthis is thecase?
Some Traits are Sex-linked
Which dragontrait(s)is/are sex-linked?
How dosex-linked traits differ from autosomal traits?
Color and Lethal Combinations
Describehow the inheritance ofcolor is different from that of horns and/orwings.
On whichchromosome is the lethal combination exhibited? What is the lethalcombination?
Meiosis
What is the phenotypeof your new dragon?
Whichtraits areinherited from the mother dragon? AND Which traits are inherited from the father dragon?
Wereany traits expressed by the offspring that differed from either or both of the parents? If so, whatwere they?
How does meiosisallow for variation inoffspring?
How doesfertilization allow for variation in offspring?
Pedigree and Genes
Now that you know how to breed dragons, let'stry some selective breeding in the pedigree view. Use the cross tool tobreed a new generation of dragons; breed two of thedragons from this new (F1) generation. Repeat thisat least8 times.
What do younotice about the dragons as you continue to breed more generations?
Use the chromosome tool to closelyexaminethe dragonsâ genes. If you had trouble answering the sex-linkedquestion above, now you can observe and compare the Xand Y chromosomesâ¦
Can you find any genesthat are different among the members of your F8generation?
How many generationsdo you have to breed until all the dragons are exactly thesame?
You arecreating an inbred strain of dragons in the final generation(s)of this process. Write a notedescribing your strain, and explain what is âspecialâ aboutall individuals in an inbred strain of organisms.
The Plates Problem
Try breedingsome offspring to see resultsof these crosses. Does thepattern of inheritance ofplates tell you anything useful?
Based on yourbreeding experiments, where might you expectto find the gene forplates (i.e., On whichchromosome might the gene be located?) Why do you think this iscorrect?
Dragons thatgrow plates usually do so quite late in their life, so dragons thathave a new baby don't know right away whether or not it will growplates. Which trait(s)exhibited by a baby might helpa mother dragon determine whether her baby will growup to have plates?
