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LBL 6. Patterns of inheritance Ch 7 2019.docx.docx
LBL_6._Patterns_of_inheritance_Ch_7_2019.docx.docx
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LBL 6. Patterns of inheritance Ch 7 2019.docx.docx...
LBL_6._Patterns_of_inheritance_Ch_7_2019.docx.docx-BIOL 102 Biology Now - 2018
LBL 6. Patterns of inheritance Ch 7...
LBL_6._Patterns_of_inheritance_Ch_7_2019.docx.docx-BIOL 102 Biology Now - 2018
Page 1
BIOL 102
Biology Now - 2018
Learn Before Lecture Worksheet-6
Chapter 7 pp 116-123: Paerns of Inheritance
(Dog Days of Science)
Answer the questions below as you read the narrative of the chapter.
1a. What is a gene?
basic unit of informaon affecng a genec trait
1b. What is a genec trait?
any inherited characterisc of an organism that can be observed or detected
in some manner
1c. What is an invariant trait?
they are the same in all individuals of the species
What example do they give?
all soybeans have pods that contain seeds
1d. What is a variable trait?
traits that are different in each individual of a species
List two of the examples they give: soybeans come in various sizes and colors
1e. What are the three general types of traits are influenced by genecs?
physical, biochemical,
behavioral
Geng to the Genes
2a. Define “allele”
different versions of a given gene
2b. What is the difference between genotype and phenotype?
Define each term:
Genotype: the genec makeup controlled by the combinaon of alleles
Phenotype: the physical expression of the genec makeup
Pet Project
Learn the terms “dominant” and recessive”.
Then answer the following quesons:
3a. List all of the poodle fur gene combinaons that are homozygous
(give the leer combinaons)
: bb BB
List all of the poodle fur gene combinaons that are heterozygous
(give the leer combinaons)
: Bb
3b. Which phenotype will a heterozygous individual show? Circle one:
the dominant phenotype
/ the
recessive phenotype
/
the heterozygous phenotype.
Crisscrossing Plants
4a.
Write the genotypes of the two, true-breeding plants Mendel used in his P-generaon:
_PP_
x
_pp__
4b. What is the genotype of all F1 plants? _____Pp____
4c. As you read, complete the Punne squares for this single gene cross.
You can put your cursor in each cell of
the table as you work
:
add the alleles from the male parent across the top.
add the alleles from the female parent down the side.
fill in the boxes to show the possible genotypes of the offspring.
P
p
P
PP
Pp
p
Pp
pp
Page 2
BIOL 102
Biology Now - 2018
4d. What proporon of the offspring is predicted to have genotype PP?
__1_ / 4
What proporon is predicted to have genotype Pp?
_2__ / 4
(which is the same as _1__ / 2)
What proporon is predicted to have genotype pp?
_1__ / 4
5. Read “What Are the Odds?” on pg 124 and answer the following queson:
In the pea plants example
above, if you get just 4 plants in the F
2
generaon, will you get 1PP, 2Pp, and 1pp offspring?
Circle one:
a)
Yes, definitely
b)
No, you will never get exactly that rao
c)
Not necessarily-you can’t predict with certaint
y that you will get this exact combinaon.
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