Standard 4: Genetics
Objective 4.3: Punnett Square
Explain that cells contain thousands of genes, and typically
have two copies of every gene. The two copies (or alleles) of the gene may or
may not be the same. Demonstrate, using a punnett square, that one copy may be
dominant in determining a trait while the other is recessive.
□
I can explain the process by which a cell may end up with two different
alleles for a trait.
□
I can successfully complete and interpret a Punnett Square.
□
Punnett Square
□
Vocabulary
□
Objective 4.3 Study Guide
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Vocabulary for Objective 4.3
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Explain that cells contain thousands of genes, and typically
have two copies of every gene. The two copies (or alleles) of the gene may or
may not be the same. Demonstrate, using a punnett square, that one copy may be
dominant in determining a trait while the other is recessive.
Vocabulary: CHAPTER 6 SECTION 1
(Life Science, Holt)
Define these words in common language.
1.
heredity
2.
self-pollinating
plant
3.
true-breeding
plant
4.
dominant trait
5.
recessive trait
6.
genes
7.
alleles
8.
Punnett square
9.
probability
10. genotype
11. phenotype
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vocabulary words!
Objective 4.3: Punnett Square
Explain that cells contain thousands of genes, and typically
have two copies of every gene. The two copies (or alleles) of the gene may or
may not be the same. Demonstrate, using a Punnett square, that one copy may be
dominant in determining a trait while the other is recessive.
Study Guide: CHAPTER 6 SECTION
1 (Life Science, Holt)
Explain each concept
□ Heredity is the passing on of traits from
parents to offspring.
□ Traits are inherited forms of characteristics.
□ Gregor Mendel used pea plants to study
heredity.
□ Mendel’s pea plants were self-pollinating.
□ They contained both male and female
reproductive structures.
□ They were also true breeding, always producing
offspring with the same traits as the parents.
□ Offspring inherit two sets of instructions
for each characteristic, one set from each parent.
□ The sets of instructions are known as
genes.
□ Different versions of the same gene are
known as alleles.
□ If the dominant allele and the recessive
allele are inherited, only the dominant allele is expressed.
□ Recessive traits are apparent only when
two recessive alleles for the characteristic are inherited.
□ A genotype is the combination of alleles
for a particular trait.
□ A phenotype is the physical expression of
the genotype.
□
Probability is the chance
that an event will occur expressed as a fraction or a percentage.