13 Genetics and Biotechnology
1 Applied Genetics
6(F)
MAINIDEA
Write the Main Idea for this lesson.
REVIEW VOCABULARY
Recall the definition of the Review Vocabulary term.
hybrid
hybrid
NEW VOCABULARY
Use your book to define each term. Then look through the section to
find a sentence with each term and write the sentence.
selective breeding
inbreeding
selective breeding
test cross
inbreeding
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test cross
1 Applied Genetics (continued)
Student Edition, pp. 360–362
Reading Essentials,
pp. 143–145
GET IT?
Describe the disadvantages associated with hybridization
and inbreeding.
Analyze inbreeding and hybridization by identifying the effect, an
advantage, and a disadvantage of each.
Inbreeding
advantage:
effect:
Copyright © McGraw-Hill Education. Permission is granted to reproduce for classroom use.
disadvantage:
Hybridization
advantage:
effect:
disadvantage:
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1 Applied Genetics (continued)
Analyze the use of a test cross to determine the genotype of a
yellow flower by completing the prompts. The first one has been done
for you.
The genotype of the white flower:
Possible genotypes of the yellow flower:
Possible
Possible
Phenotypes
Genotypes
offspring if the
yellow flower is
heterozygous
offspring if the
yellow flower is
homozygous
Create a Punnett Square that shows the result of each test cross.
Heterozygous:
Homozygous:
In a test cross, the
of the offspring can reveal the
of the parents.
CONNECT
Selective breeding practices have been used since ancient times. Provide specific examples
where selective breeding has resulted in plants or animals that are familiar to us today.
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Summarize how test crosses work by using the words genotype and
phenotype to complete the sentence.
1 Applied Genetics (continued)
REVIEW IT !
1. MAINIDEA Assess the effect of selective breeding on food crops.
2. Describe three traits that might be desired in sheep. How can these traits be passed on
to the next generation? Explain.
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3. Compare and contrast inbreeding and hybridization.
4. Predict the phenotype of offspring from a test cross between a seedless orange (ss) and
an orange with seeds (Ss).
5. Evaluate Should a cow and a bull that both carry recessive alleles for a mutation that
causes decreased milk production be bred? Why or why not?
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