Download Life Science Week 25

Life Science Week 25
Heredity
Standard S7L3a
• Explain the role of genes and
chromosomes in the process of
inheriting a specific trait.
Standard S7L3.c
• Recognize that selective
breeding can produce plants or
animals with desired traits.
Monday Warm Up (121)
• Find one trait (characteristic) that everyone
at your table share.
• Examples: freckles, cleft chin, dimples,
blues eyes, brown eyes, tongue rolling,
widow’s peak, etc.
Pre-Test Heredity/Genetics
• 1. The uppercase letter W represents the
dominant allele for white wool in sheet. The
recessive allel for black wool is represented
by the lowercase w. All the offspring of two
sheep are black. What are the genotypes of
the offspring?
– A. Ww
B. ww
C. WW
D. black
• 2. In anole lizards, the dominant allele L
governs the trait for long tails. The
recessive allele l governs the trait for short
tails. A female lizard with the genotype LL
mates with a male lizard with the genotype
Ll. What phenotype(s) will their offspring
have?
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A. long tails
B. short tails
C. medium-length tails
D. either long or short tails
• 3. Suppose hair color for cats exhibits
incomplete dominance. The male cat has the
following alleles for black fur: (BB). The
female cat has the following alleles for
white fur: (WW). What will be the
phenotype of all the offspring from this
cross?
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A. BW
B. WW
C. black fur
D. gray fur
• 4. Which of the following does NOT affect
the traits that an organism inherits?
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A. DNA
B. Punnett square
C. gene
D. chromosome
• 5. Where are genes located?
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A. inside the chromosomes in a cell’s nucleus
B. inside the DNA in a cell’s nucleus
C. inside the alleles in a cell’s cytoplasm
D. inside the traits in a cell’s cytoplasm
• 6. Which lists the structures in the nucleus
of a cell from smallest to largest?
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A. DNA, allele, gene, chromosome
B. gene, DNA, allele, chromosome
C. gene, DNA, chromosome
D. DNA, gene, chromosome
• 7. A person has attached earlobes, which is
a recessive trait. What two alleles make up
the gene responsible for this trait.
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A. one for attached, one for unattached.
B. two for unattached
C. two for attached
D. one for unattached, two for attached
• 8. An animal has 32 pairs of chromosomes
in its body cells. How many chromosomes
would one of its gametes have?
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A. 8
B. 16
C. 32
D. 64
• 9. Which is NOT true of selective breeding?
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A. It always produces unhealthy offspring.
B. It can be used to weed out weak genes.
C. It can be used to pass on desirable genes.
D. It has been used by humans for thousands of
years.
• 10. Which is MOST likely the goal of
selective breeding on a farm?
– A. a cow that produces less milk than other
cows
– B. a horse that is stronger than other horses
– C. corn that is smaller and less flavorful than
other corn
– D. wheat that is less hearty than other wheat.
Video
• Biologically Speaking: Genetics and
Heredity
Tuesday Warm Up (121)
• How did you end up with the color of eyes
that you have?
Trait Analysis
Trait
Earlobe
Mid-digital hair
Campodactyly
Freckles
Cleft Chin
Hitchhiker’s Thumb
Tongue Roller
Eyelashes
Hand Clasp
Eye Pigmentation
Dimples
Big Toe
Hairline
Colorblindness
Dominant
Recessive
Trait Analysis
Trait
Earlobe
Mid-digital hair
Campodactyly
Freckles
Cleft Chin
Hitchhiker’s Thumb
Tongue Roller
Eyelashes
Hand Clasp
Eye Pigmentation
Dimples
Big Toe
Dominant
Recessive
Trait Inventory
• Create a class chart for trait inventory
• Create bar graphs of traits.
Wednesday Warmup (121)
• Compare and contrast dominant and
recessive traits.
Cornell notes p. 114 – 119
Section Review p. 119
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Heredity
Who was Mendel
Self-pollinating
Cross-pollination
Traits
Dominant trait
Recessive trait
Ratio in Mendel’s experiment
Cornell notes p. 114 – 119
Section Review p. 119
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Heredity
Who was Mendel
Self-pollinating
Cross-pollination
Traits
Dominant trait
Recessive trait
Ratio in Mendel’s experiment
Cornell notes p. 114 – 119
Section Review p. 119
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Heredity
Who was Mendel
Self-pollinating
Cross-pollination
Traits
Dominant trait
Recessive trait
Ratio in Mendel’s experiment
Cornell notes p. 114 – 119
Section Review p. 119
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Heredity
Who was Mendel
Self-pollinating
Cross-pollination
Traits
Dominant trait
Recessive trait
Ratio in Mendel’s experiment
Cornell notes p. 114 – 119
Section Review p. 119
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Heredity
Who was Mendel
Self-pollinating
Cross-pollination
Traits
Dominant trait
Recessive trait
Ratio in Mendel’s experiment
Cornell notes p. 114 – 119
Section Review p. 119
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Heredity
Who was Mendel
Self-pollinating
Cross-pollination
Traits
Dominant trait
Recessive trait
Ratio in Mendel’s experiment
Thursday Warmup (121)
• When you compute the average number of
times a particular genotype will occur in
offspring, how does that compare to the
number that will actually occur?
• For example, if BB and bb cross, how will
the expected genotypes compare to the
actual genotypes?
Cornell notes p. 120 – 125
Section Review p. 125
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Genes
Alleles
Phenotype
Genotype
Punnett square
probability
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Calculating probabilities
Incomplete dominance
Genes per trait
Influence of the
environment
Cornell notes p. 120 – 125
Section Review p. 125
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Genes
Alleles
Phenotype
Genotype
Punnett square
probability
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Calculating probabilities
Incomplete dominance
Genes per trait
Influence of the
environment
Cornell notes p. 120 – 125
Section Review p. 125
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Genes
Alleles
Phenotype
Genotype
Punnett square
probability
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Calculating probabilities
Incomplete dominance
Genes per trait
Influence of the
environment
Cornell notes p. 120 – 125
Section Review p. 125
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Genes
Alleles
Phenotype
Genotype
Punnett square
probability
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Calculating probabilities
Incomplete dominance
Genes per trait
Influence of the
environment
Cornell notes p. 120 – 125
Section Review p. 125
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Genes
Alleles
Phenotype
Genotype
Punnett square
probability
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Calculating probabilities
Incomplete dominance
Genes per trait
Influence of the
environment
Cornell notes p. 120 – 125
Section Review p. 125
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Genes
Alleles
Phenotype
Genotype
Punnett square
probability
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Calculating probabilities
Incomplete dominance
Genes per trait
Influence of the
environment
Friday Warmup (121)
• Complete this Punnett Square. What
percentage show the trait (phenotype) of R.
R
r
r
r
Cornell Notes p. 126 – 133
Section Review p. 133
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Asexual reproduction
Sexual reproduction
Homologous
Chromosomes
Meiosis
Steps of Meiosis (fig
3)
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Sex chromosomes
Sex linked disorders
Pedigree
Selective breeding
Cornell Notes p. 126 – 133
Section Review p. 133
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Asexual reproduction
Sexual reproduction
Homologous
Chromosomes
Meiosis
Steps of Meiosis (fig
3)
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Sex chromosomes
Sex linked disorders
Pedigree
Selective breeding
Cornell Notes p. 126 – 133
Section Review p. 133
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Asexual reproduction
Sexual reproduction
Homologous
Chromosomes
Meiosis
Steps of Meiosis (fig
3)
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Sex chromosomes
Sex linked disorders
Pedigree
Selective breeding
Cornell Notes p. 126 – 133
Section Review p. 133
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Asexual reproduction
Sexual reproduction
Homologous
Chromosomes
Meiosis
Steps of Meiosis (fig
3)
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Sex chromosomes
Sex linked disorders
Pedigree
Selective breeding
Cornell Notes p. 126 – 133
Section Review p. 133
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Asexual reproduction
Sexual reproduction
Homologous
Chromosomes
Meiosis
Steps of Meiosis (fig
3)
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Sex chromosomes
Sex linked disorders
Pedigree
Selective breeding
Cornell Notes p. 126 – 133
Section Review p. 133
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Asexual reproduction
Sexual reproduction
Homologous
Chromosomes
Meiosis
Steps of Meiosis (fig
3)
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Sex chromosomes
Sex linked disorders
Pedigree
Selective breeding
Friday Closing (133)
• How are dominant and recessive genes
displayed?