Lesson 1 grade 8 American genetics .PPT.pptx

heridity

1. Lesson 1: How Traits change Biology Department Grade 8 American Sep2024. Ms.Alia Mousa Part 1

2. Lesson objectives:

3. What is heredity? What is genetics traits? How can a trait change? What is a mutation?

4. Hamad’s family: Granddad is Hamad Son is Abdullah Daughter in low is Fatima Grandchild is Khalifa

5. Examine Hamad's family photo and identify the common characteristics shared between Khalifa and his family.

6. John’s Family Mother is Jean Daughter is Kate Little daughter is Jasmin Son is Michale

7. https://www.youtube.com/watch?v=F_vxBortInk https://www.youtube.com/watch?v=ZP27an9HraA

8. Father Mother Kitten How does DNA affect traits?

9. DNA: Deoxy ribonucleic acid

10. Chromosomes : Is a DNA molecule that consists of a part or all of the genetic material of an organism. Chromosomes are thread-like structures present in the nucleus, which carries genetic information from one generation to another. They play a vital role in cell division, heredity, variation, mutation, repair and regeneration.

11. Gene: The basic unit of heredity passed from parent to child. Genes are made up of sequences of DNA and are arranged, one after another, at specific locations on chromosomes in the nucleus of cells.

12. The Punnett square is a square diagram that is used to predict the genotypes of a particular cross or breeding experiment . The genotype of an organism is its complete set of genetic material .   An organism's phenotype is all of its observable characteristics , such as height, eye color and blood type. A person's phenotype is determined by both their genomic makeup (genotype) and environmental factors.

13. What is an allele? Allele is a different form of the same trait What is the dominant allele? T he version of the trait that is expressed over other alleles for the same trait ’  This is because the dominant allele refers to the version of a gene that will be expressed regardless of the other allele present in the pair. What is a recessive allele?   A type of allele that when present on its own will not affect the individual. Two copies of the allele need to be present for the phenotype to be expressed .

14. https://www.youtube.com/watch?v=nDwyHa4nRzs&t=38s https://www.youtube.com/watch?v=rdJzAbRMC2o&t=3s https://www.youtube.com/watch?v=KVUjpoZ12k0

15. Do you think traits are inherited or acquired?

16. Now Can we define: Heredity is Traits is a characteristic that can be passed from one generation to the next. Allele is a different form of the same trait. Dominant allele is Recessive allele is Mutation is …………………………………………….