Ch. 7.1 Scientists develop systems for classification.

Vocabulary: evolution, ancestor, trait, classification, taxonomy

Review 7.1
1. Classification allows taxonomists to organize a lot of data so that it is easy to find and understand.
2. Taxonomists study biological relationships to discover how one species evolved as compared with another species.
3. Scientists look at DNA and compare genes of organisms.
4. Having a universal naming system allows people speaking different languages to refer to all organisms the same way.
5. a marbled godwit would have marbled feathers, wings, feet, a beak.
6. Compare physical traits, such as color, size, weight, and how they get energy; analyze bones; compare to fossils; compare DNA

Ch. 9.1 Single-celled organisms have all the characteristics of living things.

Vocabulary: matter, molecule, species, binary fission, kingdom, microorganism, virus

9.1 Review
1. very large organism: huge fungus, very small organism: single-celled bacteria
2. growth, reproduction, organization, and response to environment
3. enery, material, and living space
4. A dog is made of cells that perform specific functions. It starts as a puppy. As its cells reproduce, it grows to a full-sized dog. Male and female dogs reproduce sexually to create more puppies. Dogs bark at, run at, or run from different things they sense.
5. There is room in a lake for many billions of microscopic organisms but not for nearly as many larger organisms.
6. (Drawings will differ.)

Here is a video on Binary Fission. Please leave a comment. Make sure to write your name and group and list # so that I can check that you saw the video.

Ch. 1.1 The cell is the basic unit of a living thing.

Vocabulary Words: cell, genetic material, organism, theory, unicellular, multicellular, microscope, bacteria

Review 1.1
1. organization, growth and development, response to environment, reproduction

2. It allowed people to see cells. Before the microscope humans did not realize that life could be so small.

3. Every living thing is made of one or more cells; cells carry out the functions needed to support life; cells come only from other living cells.

4. The cell theory is widely accepted and explains observations of nature, and is supported by evidence such as Pasteur´s experiments.

5. multicellular: many cells, complex, easier to see; unicellular: one cell, cannot be seen directly; both: need energy, materials, and living space

6. In Pasteur´s experiment, bacteria did not grow spontaneously. They came from the environment, which indicates that cells come from other cells.

WELCOME BACK TO SCHOOL

Welcome 7th Grade Students to Ms. Silvia´s Biology blog. Here you will be able to see the lessons that we are working on in class. The vocabulary and answers to the reviews will be posted here. You will also be able to see exciting videos and power point presentations.



Here is the list of your obligations in Biology class.

1. Respect and discipline are a must for a safe learning environment.
2. Students must be in the classroom when the teacher enters. Any student that arrives late to class must have a written notice from a teacher to be able to enter.
3. Shirts must be tucked in at all times.
4. Students must always speak English.
5. Books and notebooks must be kept in good condition.
6. Use blue or black pen to write in notebooks and to answer quizzes. You may answer questions in your notebook in pencil so that you can make corrections.
7. Homework should be turned in on time. The consecuence for not doing so is a zero.
8. Your work must be done with correct spelling and good penmanship.
9. Your notebook is an important study tool so make sure that it is always complete.
10. Participation is necessary and mandatory.
11. Quizzes must be pasted in notebook and signed by parent. Points will be taken off if not done so.

Ch. 11.4 Many plants reproduce with flowers and fruit.

Vocabulary: angiosperm, flower, fruit

Review:
1. Ovary of flower becomes fruit.
2. Some animals feed on nectar, carrying pollen from flower to flower. Others eat fruit and disperse seeds as waste.
3. Sample answers: oxygen, food, material, coal and gas, wood, paper, fabric, medecine
4. flowering plants because insects feed on nectar and fruit
5. Upper part of pistil becomes stem, fertilized eggs become seeds, ovary becomes fruit.

Ch. 20.3 The reproductive system allows the production of offspring..

Vocabulary: menstruation, fertilization, embryo, fetus

Review:
1. male: makes sperm cells; female: makes egg cells; nourishes offspring until birth
2. Hormone stimulates eggs in ovary to develop. Hormone signals egg to move through fallopian tube to uterus.
3. Embryo is ball of cells; fetus has beginnings of features, organs, and skeleton.
4. Fertilized egg moves down fallopian tube; it divides and continues as a ball of cells; forms an embryo; embryo implants in uterus.
5. signal cells in testes to develop into sperm; signal ovaries to release eggs
6. Hormones from endocrine system signal sexual development. In females, hormones make egg develop and make ovary release it.

Ch. 4.3 Meiosis is a special form of cell division.

Vocabulary: gamete, egg, sperm, fertilization, meiosis.

Review:
1. A gamete (haploid)
2. A sperm and an egg combine to form a new cell.
3. Meiosis produces 4 1n gametes instead of 2 2n cells. It involves 2 divisions after DNA is copied, rather than 1 division after DNA is copied.
4. ProphaseI: one cell contains twice usual number of chromosomes for species; prophase II; two cells each with two copies of one homolog of each chromosome pair.
5. Meiosis: produces 4 1n cells, 2 divisions; mitosis: produces 2 2n cells, one division; both: DNA copied, chromosomes divide, new cells form.
6. One cell divides twice, so one cell produces four. The cells are 1n because DNA was only copied only once.