Mendel and Genetics Notes (p. 75)
Part One: Using your reader, match the vocabulary word below with its correct definition. You will use each word from the
word bank below one.
WORD BANK
1)
Purebred
Allele
Recessive
Cross
Homozygous
Phenotype
Genetics
Heterozygous
Genotype
Gene
Dominant
Punnett Square
_______________________________ is an
alternative form of a gene that occupies a specific place
on a chromosome, such as the space that codes for
specifically the hair color brown versus the space that
codes for blonde hair.
____________________ describes the mating of
two organisms.
The _________________________ allele is the
allele that is expressed when two different alleles are
present in an organism’s genotype. This word is used
to describe the trait we more commonly see and is
denoted with an uppercase letter (Y).
____________________ is the specific region of
DNA that codes for a particular protein.
The study of heredity patterns and variation in
organisms is known as
__________________________.
The collection of all an organism’s genetic information
that codes for traits is called its
__________________________. This refers to the
genes (such as YY or Yy), rather than the physical
appearance of the organism.
2)
3)
4)
5)
6)
7)
If an organism is __________________________, it
has two different alleles that appear at the same locus
of homologous chromosomes or two different letters
in its genotype (Yy).
8) If an organism is
_____________________________, it has the
same alleles at the same locus of homologous
chromosomes or the same two letters in its genotype
(YY or yy).
9) The collection of all of an organism’s physical
characteristics is called its
________________________________. This
refers to the physical appearance of the organism
rather than the genes (YY or Yy).
10) A _________________ _________________ is a
model for predicting all possible genotypes resulting
from a cross or mating.
11) A _________________________ organism is a type
of organism whose ancestors are genetically uniform.
12) A ________________________ allele is one that is
not expressed unless two copies are present in an
organisms DNA. It is denoted with a lowercase letter
(y).
Part Two: As we go through the PowerPoint, fill in the information and complete the Punnett Squares.
13) In his P or parent generation, Gregor Mendel crossed two different purebred plants, one with ____________ peas and one with _____________ peas.
This created the G1 or 1st generation.
14) In his G1 or 1st generation, Mendel saw that 100% of the peas were _________________________.
15) In his G2 or 2nd generation, Mendel saw that 75% of the peas were _________________________ and the other 25% of the peas
were____________________.
16) Having yellow peas is the _________________________ trait and having green peas is the ________________________ trait.
17) The genotype of the homozygous dominant plant in P generation was ___________ and its phenotype was ________________.
18) The genotype of the homozygous recessive plant in P generation was ___________ and its phenotype was ________________.
19) The genotype of the heterozygous plant in the G1 generation was ___________ and its genotype was ____________________.
G1 Punnett Square
G2 Punnett Square
Y
Y
Y
y
y
Y
y
y