Do NowWhat are some traits that you share with your parents ?

( example I have dark brown eyes and my dad have dark brown eyes)

Genetics; is the study of how traits are passed on

Trait - characteristics

Heredity-passing of traits from parents to offspring

FATHER OF GENETICS: GREGOR MENDEL In 1865 Gregor Mendel; a monk found that traits are determined by genes. So your traits are because of the genes you inherited from your parents. Gregor however did not studied human. He started out by studying the genes of pea Plants. Can you suggest why?.

http://www.dnaftb.org/1/animation.html

Genes comes in pairs, the genes that carry the same trait is called an allele

Recessive, the trait that is hiddenDominant - the trait that is shown

Variation- differences that exist within a species.

Homozygous (pure)- A zygote with the same kind of genes for a particular trait

Heterozygous ( hybrid)- organisms have two different gene for a given trait

Genotype- The genetic make up of an individual

Phenotype- The physical make up of an individual

1) The Law of Segregation: Each inherited trait is defined by a gene pair.

2) The Law of Independent Assortment: one trait is not dependent on the inheritance ofanother.

3) The Law of Dominance: gene will express the form that is dominant.

Using Symbols to figure out the genotype and phenotypeThe dominant gene trait (gene) is represented by capital letters and the recessive trait (gene) is represented bylower case letters.

For example, in pea plants the dominant gene for tallness is represented by T, while the recessive gene for shortness is represented by t. . A homozygous organisms for tallness is represented by TT and heterogeneous organism is represented by Tt.

GENETIC DIAGRAMS AND PUNNET SQUARES

Dihybrid cross

Question

What percentage of offspring will be homozygous green, if the parents are both heterozygous green. Green is dominant over yellow.