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) .
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
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
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).Fertilization
Why does sexual reproduction require meiosis?
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)
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
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
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.
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?
Meiosis & Stages
Sickle Cell Anemia
PedigreeGenetics Vocabulary chart or flashcards due 3/12/14
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