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3/10/14 116 th Day of School. Learning goal (7.L.2.1): I will be able to explain why offspring that result from sexual reproduction (fertilization and meiosis) have greater genetic variation than offspring that result from asexual reproduction (budding and mitosis) .

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3 10 14 116 th day of school

3/10/14116th Day of School

Learning goal (7.L.2.1): I will be able to explain why offspring that result from sexual reproduction (fertilization and meiosis) have greater genetic variationthan offspring that result from asexual reproduction (budding and mitosis).

Due Today:Meiosis diagram and progress reports

Evening Assignment: Finish vocabulary flashcards or chart; Study for Test

do now

On the slip of paper write your name and answer the following questions:

Which type of reproduction leads to more genetic variation? Explain why.

Use the pictures below as part of your explanation.

Do Now

Asexual reproduction

Sexual reproduction

meiosis and punnett squares

Meiosis is the process by which the number of chromosomes is reduced by half to form gametes (reproductive cells: sperm & egg in humans and animals or pollen & ovule in plants).

This Punnett square shows how alleles separate when sex cells form during meiosis. It also

shows the possible allele

combinations that can result

after fertilization occurs.

(READ pages C98-100 in the green Prentice Hall textbook).

Meiosis and Punnett Squares

Fertilization is the process that takes place when a male gamete (sperm) and a female gamete (egg) combine to form one new cell. In humans, an egg cell with 23 chromosomes joins a sperm cell with 23 chromosomes to form a new 2n cell with 46 chromosomes. (READ pages C117-119 yellow McDougal book).


Why does sexual reproduction require meiosis?

source of genetic variation mutation reproduction recombination

As you watch and listen, write in your science notebook some sources of genetic variation (i.e. things that lead to differences in traits and individuals).

Source of Genetic Variation: Mutation & Reproduction (Recombination)


genetic variation sexual vs asexual reproduction


In your science notebook, READ and take NOTES on the differences between asexual vs. sexual reproduction. Think about how genes (traits) are passed from parent to offspring for each. Also note some examples of each type.

Which type of reproduction leads to more genetic variation and why?

Genetic Variation: Sexual vs. Asexual Reproduction
key terms

McDougall pgs. C102-103

Key Terms

Homologous Chromosomes (from father & mother)

Sister chromatids (replicated chromosomes)


key terms1



Homologous Chromosomes (from father & mother)

Sister chromatids (replicated chromosomes)

Meiosis: process of cell division where DNA is replicated (copied) then separated and divided twice to produce new cells called gametes (reproductive cells)

Key Terms

Read McDougall pages C120-121 about Meiosis.

Then watch the Meiosis animation detailed on the next slide.

Use the two resources to create a labeled diagram showing and describing what happens to the chromosomes in each stage of meiosis.


Watch the Meiosis (Narrated) animation and take notes on what happens to the DNA (genes) and chromosomes during each stage of meiosis. Turn on show text to help you take notes.


genetics vocabulary chart or flashcards due 3 12 14

On the BACK

On the FRONT

Definition/characteristics: A trait or characteristic that is developed or learned through life. Traits you aren’t born with. Traits GENERALLY not controlled by DNA.


Walking, speaking English,

dyed hair, pierced ears,

Glasses, skin cancer?

Acquired Trait





Gregor Mendel

Pea Plants

Genetic VariationFertilization


Asexual Reproduction

Acquired trait

Inherited trait

Sexual reproduction






Meiosis & Stages

Punnett Square

Monohybrid cross


Heterozygous (Hybrid)


Genetic Disorder

Sickle Cell Anemia



Genetics Vocabulary chart or flashcards due 3/12/14
genetics projects due 3 21 14

Choose ONE of the following projects to do as a summative MAJOR assessment for the Genetics Unit. Do detailed, quality work to get full credit.

Genetics Projects – due 3/21/14
evening assignment

This evening…

  • Finish vocabulary.
  • Test Wednesday over
    • Traits
    • Punnett squares
    • Pedigrees
    • Meiosis
Evening Assignment