SCIENCE

THIRD PERIOD

SCIENCE

Monohybrid cross

In humans Brown eyes are dominant over blue eyes. What type of offspring would you expect if you cross a heterozygous Brown eyed persona to a heterozygous Brown eyed person?

MONOHYBRID=ONE TRAIT-COLOR OF THE EYES

DIHYBRID=TWO TRAITS- COLOR AND SHAPES

DOMINANT: the allele that can cover the expression of the other

RECESIVE: the one that is cover

PHENOTYPE: physical expression of the trail- black hair, blue eyes

GENOTYPE: genetic info- alleles

I ONLY NEED ONE DOMINANT ALLELE TO EXPRESS A CERTAIN CHARACTERISTIC

 A MAN WHOSE PARENTS WERE NORMAL WITH RESPECT FOR COLOR VISION, MARRIES A WOMAN OF NORMAL VISION AND SIMILAR PEDIGREE. ONE OF THEIR DAUGHTERS IS COLORBLIND. GIVE THE GENOTYPES OF THIS DAUGHTER, HER PARENTS AND PATERNAL GRAND PARENTS. IS THE FATHER COLORBLIND?

SUMMARY:

MENDELS LAWS

1.    LAW OF DOMINANCE:

You have one dominant allele over the other and the dominant expresses characteristic

2.    LAW OF SEGREGATION

You have two alleles from each trait but when you receive the gene you can just pass one

3.    LAW OF INDEPENDENT ASSORTMENT

An allele can be combined with any other allele

ORIGIN OF THE UNIVERSE

-       Big bang: explosion that created the universe

-       Milky way: sun- 9 planets

-       Earth:

1.The origin of life in earth (how the earth has changed from the beginning to the current conditions)

Earth has existed since more tan 4 billion years ago and has resisted several times in which not only environment but temperatures have changed and all of this changes come from volcanic to cooled temperatures, and all of this transformations bring the world to what its today. With all of this changes not only surroundings but species have emerged and extinct

2.How the life started in the planet?

Possible explanations for the beginning of life

•Metabolism: the ability to break down carbon dioxide in small organic molecules

•Genes: molecules that developed and reproduce

•RNA: RNA molecules developed making changes in DNA

•LUCA: organism developed through time and out of that organism, others 

come. LUCA is considered an ancestor