1 Who is Gregor Mendel An Austrian monk

1. Who is Gregor Mendel? An Austrian monk who disproved the idea of “blended inheritance” more than 150 years ago. “Father of Genetics” 2. Mendel is known as the _____________

3. Why did Mendel study pea plants? 1. They reproduce quickly. Many plants = lots of data 2. Easily observable traits, such as flower color and pea shape 3. Mendel could easily control plant reproduction

4. Explain what happened during Mendel’s first generation crosses (p. 392) a. Purple x Purple = All purple b. White x White = All white c. Purple x White (both true-breeding) = All purple

5. When Mendel bred a true-breeding purple and a truebreeding white plant he got all purple offspring. Is this what you would have expected? Why or why not? Most people would probably expect to have half purple and half white flowers. Most would not expect to have no white flowers at all!

6. Explain what happened during Mendel’s second generation crosses (See page 393) a. Purple hybrid x Purple hybrid = Purple and white offspring!

7. By studying pea plants Mendel was able to determine that some traits are _______ while others are dominant blocked or _________. recessive

Define: 8. Heredity - The passing of traits from parents to offspring 9. Genetics - The study of how traits are passed from parents to offspring

10. Dominant Trait – A genetic factor that blocks another genetic factor 11. Recessive Trait - A genetic factor that is blocked by the presence of a dominant factor

Do an organism’s characteristics and traits mix (like colors of paint) to resemble both their parents? Explain. Usually No, children are not a perfect mixture of their parents’ traits!

Heredity _______ is the passing of traits from parents to offspring, Genetics while ________ is the study of how traits are passed from parents to offspring.

Mendel’s Experimental Methods Pollination in pea plants can occur through both self cross _______-pollination and ____-pollination

What is cross-pollination? When pollen from one plant reaches the pistil of a flower on a different plant.

What is self-pollination? When pollen from a flower pollinates the same flower or another flower in the same plant.

Which type of pollination? Cross-pollination Self-pollination

List the 4 main steps of Mendel’s crosspollination technique (page 391) 1. Mendel removed the stamens from the purple flower. 2. He transferred pollen from the stamens of the white flower to the pistil of the purple flower. 3. The pollinated pistil of the purple flower grew into a pea pod. Then Mendel planted the peas. 4. The peas grew into plants.

Add to notes: not in packet True-breeding – has genes for the same trait B= brown, b= blue (example: BB, bb) Hybrid – has different genes for the same trait (example: Bb)

When a true-breeding plant selfpollinates, it always produces offspring with traits that _________ match the parent (page 391)

Hybrid plants came from true-breeding parent plants with different forms of the same trait ____________ (page 393)

When Mendel crossed two hybrids for a trait, the trait that had disappeared 3: 1 then reappeared in a ratio of _____. Look at page 394. What traits are dominant? ?

Mendel’s Conclusions (page 395) 2 genetic 1. Mendel concluded that ______ factors control an inherited trait. 2. When organisms reproduce each 1 factor reproductive cell contributes _____ for each trait.

3. Mendel hypothesized that in hybrid crosses the purple factor in pea plants is the only factor seen or expressed because it blocks the white factor. This means that the purple trait dominant is _______ , while the white trait is ________. recessive 4. A recessive trait is only observed when two recessive genetic factors are present. _____________

5. In a second generation of pea plant hybrids, about ______ percent of the plants had purple 75 flowers. This means that plants had at least _______ dominant factor. Twenty-five percent one of the second generation plants had white _____ flowers, which means these plants had ______ two recessive factors.

Read page 397 and answer the following questions. 1. Other than a monk and scientist, Mendel was also a ___________. Gardener and Beekeeper 2. What year was human DNA completely 2003 mapped? ________ 3. What two scientists discovered the structure of Francis Crick and James Watson DNA molecules? ___________

Inherited Traits Inventory What are YOUR visible traits? ?

What is your phenotype? ? ? Do you have detached earlobes? ?

I have a hitchhiker’s thumb

Can you roll your tongue? ?

Do you have dimples?

Are you right-handed?

Do you have freckles?

Do you have naturally curly hair?

Do you have a cleft chin?

Do you have allergies?

Do you have a widow’s peak?

Do you cross your left thumb over your right thumb?

Can you see the colors red and green?

I have brown eyes

I have mid-digital hair

My second toe is longer than my big toe

Can you taste P. T. C. ?

Interview 5 Family Member (in person or over the phone) and get signatures!! Answer follow-up questions on back!! DUE: Next Monday!!