Download 6.3 Study Guide KEY

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6.3
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MENDEL AND HEREDITY
Study Guide
KEY CONGEPT
VOCABULABY
Mendel's research shorved that traits
are lnherited as discrete units.
tra
purebred
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genetics
law of segregation
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MAIN IDEA: Mendel taid the groundwork for genetics.
1. What is genetics?
The str¡cly c'f hinlogicnl inhpritance pettprns end verintlon in ofgpnisms
2. Whose early work is the basis for much of our current
3. How did Mendel's views on inheritance
unrlerstanding of genetics?
differ from the views of many scientists of
his time?
Mendel recognized that traits are inherited as diqcrete unitq, whereas many otbers
believed that traits were mixed tooether,
MAIN IDEA: Mendel's dat¡ revealed patterns of inheritance.
In designing his experiments, Mendel made three important choices that helped him see
patterns of inheritance. In the table below, list Mendel's three choices and write an example
ofhow he put each ofthese ohoices into action.
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Mendel's Choices
Example
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4.
Control over breedlng
removed the stamens and fertllizod plstil with pollen
from a pea plant of his choice
5.
Use of purebred plants
used self-pollinating, purebred pea plants
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6. studied "either-or" traits
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looked at traits that did not hava intermediate
characteristics such as pea shape, pea color, flower
color, pod shape, pod color, flower position, and plar
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7. Why did Mendel
use pea plants?
Pea plants reproduce qtrickly. and he could control how lhey mate.
Unit 3 ßesource Book
McDougal Littell Biology
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8. Fill in the sequence
diagram below to sunrmarize Mendel's experimentål process.
flowers resulting
generation
nF,
with
0mt nant phenotype.
Allowed F1 offspring
to self-pollinate.
F,
generation
with both dominant and
recessive phgnotypes.
Calculated the
phenotypio ratios in
F2 generatlon.
9.
Mendel concluded that traits ars inherited as "discrete units." rWhat do we call these
discrete units today?
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1O. What two conclusions make up Mendel's law of segregation?
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(ìrganlsms inherll lwo noFiec nf eanh genc, onp f¡nm pa¡h parent Genes seg,fcgafp .l rrlng gnmale
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formation, so organisms donate only one copy of each gene ln their gametes.
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Vocabulary Gheck
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11, Segregation means'osepatation." What is "segtegated" in Mendel's law of segregation?
the discrete units. or genes: the result of the separation of chromosomes durlng melosls
12. ÌVhat does
study cuid€
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"purebred'n mean?
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a oeneticallv uniform line of oroanisms
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Unit 3 Resource Book
McDougal Littell Biology