Download 2-22 and 2-23 Genetics

Bellwork 2-22-2016
 Am I able to sequence a series of diagrams that depict
chromosomes movement during plant cell division?
 Can I classify methods of reproduction as sexual or asexual?
 Students will describe the principal mechanisms by which living
things reproduce and transmit information between parents and
offspring.
 Get out your scientist notebook out to check the Punnett square challenges
from Friday!
 Using what you already know write a 3 sentence summary that describes the
relationship between DNA, Genes, and Inherited Traits.
 (What are they and how are they related?)
 DNA can be broken
down into segments
called genes.
 Genes have different
combinations of
nucleotides (A-T, C-G).
 The different
combinations are what
create the different
inherited traits.
On what structures are the genes of an organism
located?
A
B
C
D
organelles
membranes
phenotypes
chromosomes
Which of these determines the physical characteristics
of an organism by controlling how cells grow and
develop?
A
traits
B
genes
C
phenotypes
D
Punnett squares
The physical traits of organisms are determined by
genes that have alternate forms. What are these
alternate forms of genes called?
A
chromosomes
B
DNA
C
alleles
D
Punnett squares
Where are the genes for the physical traits of an
organism located?
A
on a strand of RNA
B
on a chromosome
C
inside a hormone
D
inside a carbohydrate
 Hereditary information is contained in
________________
A
Genes, which are located on chromosomes
B Cells, which are located in genes
C Genes, which are located in the cell
membrane of each cell
D Specialized cells, which are located in
organelles


Each group will be given a Punnett Square
Challenge. For each challenge you must create and
interpret a Punnett square to predict possible genetic
combinations passed from parents to offspring
during sexual reproduction.
The following must be written on a loose leaf sheet of
notebook paper:
1.
2.
3.
4.
Crossed Punnett square
All possible genotypes and phenotypes of offspring
The answer to the question (percentages, ratios, etc.)
You and your team have 5 minutes.
 The Punnett square to the right shows a
cross between a tall pea plant (TT) and a
short pea plant (tt).
 Which statement about the offspring of his
cross is most likely true?
A
All the offspring will have the
same phenotype and genotype.
B
All the offspring will have the
same genotype, and half will
have the same phenotype.
C
Three-quarters of the offspring
will
be tall, and one-quarter
will be short.
D
All the offspring will grow to
medium heights.
 In pea plants, round
seeds (R) are dominant
over wrinked seed (r).
The Punnett square
below sets up a cross
between two parents
that are heterozygous for
round peas.
 Which of the following
describes all possible
genotypes resulting from
this cross?

A
B
C
D
RR and rr
RR, Rr, and rr
round seeds
wrinkled seeds
In humans, having attached earlobes (A) is
dominant to having free earlobes (a). In
which cross will 25% of offspring most
likely have free earlobes?
A
B
C
D
Aa x Aa
AA x AA
aa x aa
AA x aa