Download Dragon Lab - WordPress.com

Bellwork: Thurs. Jan. 22, 2015
Look at page 312 – figure 11-5
1. What does Mendel’s law of segregation mean?
Look at page 317 of your book:
2. What does the principle of independent assortment
mean?
Mendel’s law of segregation
During gamete formation alleles segregate or separate
from each other so each gamete carries only a single copy
of each gene
Principle of independent assortment
Genes for separate traits can segregate independently
during the formation of gametes allowing for genetic
variation even when parents are the same.
Dragon Lab
DECODING OF THE GENES
Chromosome
Dominant genes
Recessive genes
Green
A.
B.
C.
D.
E.
a. chin spike
b. no nose spike
c. four head flaps
d. three toes
e. short arms
no chin spike
nose spike
three head flaps
four toes
long arms
______________________________________________________________________
Red
F. long neck
f. short neck
G. no back hump
H. no back spikes
I. long tail
J. flat feet
g. back hump
h. back spikes
i. short tail
j. arched feet
K. red eyes
I. spots on neck
M. no fang
N. spots on back
k. yellow eyes
l. no spots on neck
m. fang
n. no spots on back
______________________________________________________________________
Orange
______________________________________________________________________
Brown
O. no spots on thigh
o. spots on thigh
P. green body
p. purple body
__________________________________________________________________________________________________________________
Sex Chromosomes
XX = female
XY= male
With your partner, decide who is the female parent and who is the
male parent.
2. Each partner must have the following colored popsicle sticks -one green, red, orange, and brown. The mother dragon must
have the pink stick and the father must have the blue stick.
1.
The pink and blue popsicle sticks represent sex chromosomes.
The green, red orange and brown chromosomes represent autosomes.
3.
4.
5.
6.
7.
Each side of a stick represents a chromosome, and the two sides
together represent a pair of homologous chromosomes (paired
chromosomes).
Before randomly mixing the genetic traits (i.e. mating) you and
your partner must record each parent’s genotype in the
appropriate data table.
For each chromosome, each parent will randomly drop his or her
stick on the table.
The side of the stick that is up represents the chromosome that is
passed on to the baby.
The alleles from each pair of homologous chromosomes will be
recorded in the data chart.
1.
The decoding indicates the phenotype of each allele.
The phenotype (trait) produced by each pair of alleles
should be recorded in the data chart. Remember that a
CAPITAL letter is dominant over the lowercase letter, or
in other words, the lowercase letter is recessive to the
capital letter.
DRAW your baby dragon once you and your partner have
figured out its phenotype.
3. Be prepared to share your drawing with the class!
2.
4.
Answer the analysis questions at the end of this lab.
4.
How does dropping the stick on the table and transcribing the letters
on the sides facing up follow Mendel’s Law of Segregation? (First state
the law)
5. Explain how dropping the green, orange, and red sticks illustrate
Mendel’s Law of Independent Assortment? (First state the law)
Mendel’s law of segregation
During gamete formation alleles segregate or
separate from each other so each gamete carries only
a single copy of each gene (1 allele_
Principle of independent assortment
Genes for separate traits can segregate
independently during the formation of gametes
allowing for genetic variation even when parents are
the same. (Especially if they are far appart on the
chromosome or on a different chromosome
Bellwork: Fri. Jan. 23, 2015
1.
Dropping the stick on the table and transcribing the letters
on the sides facing up follow Mendel’s Law of Segregation
because you write only the letters on__________________
_________________________________________________
2.
Dropping the green, orange, and red sticks illustrate Mendel’s
Law of Independent Assortment because if the genes are
on different __________________________________
____________________________________________
Mendel’s law of segregation
During gamete formation alleles segregate or
separate from each other so each gamete
carries only a single copy of each gene
Principle of independent assortment
Genes for separate traits can segregate
independently during the formation of
gametes allowing for genetic variation even
when parents are the same.
4.
How does dropping the stick on the table and transcribing the letters
on the sides facing up follow Mendel’s Law of Segregation? (First state
the law)
Each member of the allele pair separates
from the other to form the genetic make-up
of the gamete
Alleles on one side (chromosome) separate
from the other to form a new gamete
5. Explain how dropping the green, orange, and red sticks illustrate
Mendel’s Law of Independent Assortment? (First state the law)
Genes for different traits (on different
chromosomes) can segregate independently during
the formation of gametes.
Alleles on one chromosome separate independently
from alleles on another chromosome