Catalyst: 1.Mouths are quiet. 2.Homework in your folder. 3.Raise your hand if you need something.

You’ve got gametes in your fridge!

An egg is a female chicken’s gamete that was never fertilized by a male chicken’s sperm cell.

Quick Review 1. A female chicken egg cell has 39 chromosomes. How many chromosomes are in a sperm cell? 2. If they joined BEFORE the egg was laid, what would happen?

Quick Review 1. A female chicken egg cell has 39 chromosomes. How many chromosomes are in a sperm cell? 39 chromosomes 2. If they joined BEFORE the egg was laid, what would happen?

Quick Review 1. A female chicken egg cell has 39 chromosomes. How many chromosomes are in a sperm cell? 39 chromosomes 2. If they joined BEFORE the egg was laid, what would happen? A zygote would be formed that would eventually develop into a chick that would hatch from the egg.

Quick Review 3. How many chromosomes would be in the beak cell of the offspring if a zygote was formed?

Quick Review 3. How many chromosomes would be in the beak cell of the offspring if a zygote was formed? The beak (somatic) cells of the offspring would have 78 chromosomes in each cell! (39 from egg + 39 from sperm = 78)

Unit 1.10 – Meiosis vs. Mitosis BY THE END OF THE DAY YOU WILL: 1.Be able to describe the difference between mitosis and meiosis. 2.Be able to define haploid and diploid cells.

Key Point 1 1. Mitosis is the production of somatic cells a.It produces cells with the full number of chromosomes b.These cells are used in asexual reproduction, repair, and growth

Key Point 1 2. Meiosis is the production of gametes a.It produces cells with half the number of chromosomes b.These cells are used in sexual reproduction only

Key Point 1 3.Cells that have half the number of chromosomes = haploid ( gamete ) 4.Cells that have the full number of chromosomes = diploid ( somatic )

Guided Practice Work WITH us, not ahead. On the front of your notes

I-N-D-E-P-E-N-D-E-N-T “I do my own work!” DO YOU KNOW WHAT THAT MEANS?

USE THIS INFORMATION TO ANSWER SETS 1 & 2 IN THE BOXES BELOW: A spotted lemur is an organism that reproduces sexually. Male spotted lemurs have sperm cells that contain 25 chromosomes each.

Set 1: 1. Classify the lemur cell described in the scenario as either a somatic or gamete. Justify your answer. 2. How many chromosomes would be in the egg cell of a female lemur? 3. Which process would be responsible for producing the egg and sperm cells of the lemur?

Set 2: 1. Classify the lemur cell described in the scenario as either haploid or diploid. Justify your answer. 2. Consider a cell from the eye of the lemur. How many chromosomes would that cell contain? 3. If a male and a female lemur reproduce to form offspring, how many chromosomes would be in the skin cells of the offspring?

USE THIS INFORMATION TO ANSWER SETS 3 & 4 IN THE BOXES BELOW: A female kangaroo carries her baby around in her pouch. This baby has skin cells with 12 chromosomes.

Set 3: 1. Classify the kangaroo cell described in the scenario as either a somatic or gamete. Justify your answer. 2. How many chromosomes would be in a skin cells taken from the pouch of the mother kangaroo? 3. If the mother accidentally hopped into a thorn bush, which process would her body use to repair the damaged cells?

Set 4: 1. Classify the kangaroo cell described in the scenario as either haploid or diploid. Justify your answer. 2. Once the baby kangaroo becomes sexually mature, how many chromosomes will be its gametes? Are these cells considered haploid or diploid? 3. In order to be considered sexually mature the baby kangaroo must produce gametes. Which process produces gametes?

USE THIS INFORMATION TO ANSWER SETS 5 & 6 IN THE BOXES BELOW: A female red-eyed tree frog lays eggs with 13 chromosomes. After she lays them, a male red-eyed tree frog fertilizes the eggs with his sperm. Each sperm cell contains 13 chromosomes.

Set 5: 1. Classify the tree frog cells described in the scenario as either a somatic or gamete. Justify your answer. 2. In order to become fully grown tree frogs, the frog eggs shown on the screen must go through a great deal of growth and development. Which process will allow these tree frogs to grow and develop?

Set 6: 1. Classify the tree frog cells described in the scenario as either haploid or diploid. Justify your answer. 2. How many chromosomes will be in the somatic cells of the offspring? Explain your answer choice (tell me why you are correct)

Notes away, mouths closed. EXIT TICKET TIME

1. Which of the following statements is true about mitosis? A.It produces gamete cells B.It produces cells with the full number of chromosomes C.It produces cells without DNA D.It produces cells to be used in sexual reproduction

2. Which statement correctly identifies a difference between mitosis and meiosis? A.Mitosis makes new cells and meiosis destroys old cells B.Mitosis is only used during reproduction and meiosis is only used during growth C.Mitosis is used in asexual reproduction, meiosis is used in sexual reproduction D.Mitosis produces gamete cells, meiosis produces somatic cells

3. A scientist is researching the haploid cells of a rose. Which of the following statements is true about these particular cells? A.These cells are somatic. B.These cells have the full number of chromosomes for an organism. C.These cells are sex cells. D.These cells where produced through a process called mitosis.

4. Which of the following is true about somatic cells? A.They contain half the number of chromosomes as gametes B.They come together to form a new organisms in sexual reproduction C.They are considered to be diploid cells based on their number of chromosomes D.They will never be able to divide, grow, or reproduce.

5. The somatic cell of an organism contains 30 chromosomes. This cell is __________ and the organism’s gametes would have _________ chromosomes. A.Haploid; 60 B.Haploid; 15 C.Diploid; 60 D.Diploid; 15