6B-Science 3 Flashcards
Is responsible for the traits that each species possesses:
Heredety
How much have chromosomes the humans?
46
Wich the inherited traits pass from one generation to other?
Skin color, hair, etc
Where located our DNA?
In the chromosomes
Have the information that determines the inherited characterristics of the organism.
The Genes
The form a gene can take are called…
Alleles
What do a dominant allele?
The dominant alleles make the inherited trait appear
How represented the dominante allele?
By a capital Letter
TRUE OR FALSE?
A recessive allele does NOT TRANSMIT the trait, if the dominant allele is present?
TRUE
How represented the recessive allele?
By a lowercase letter
Is useful to show the ways alleles from both parents can combine?
The punnett square
Is the physical expression of a trait?
The Phenotype
Refers to our genetic constitution, makeup or alleles?
The Genotype
What is the homozygous? (FF)
when we have two identicall alleles for a given trait.
What is the heterozygous? (Ff)
When we have two DIFFERENT alleles for a given trait.
What is other name for heterozygous ?
Hybrid
What is the Codominance?
When a gene has two or more dominante allele
Occurs when one allele is not completely dominant and the organism shows an intermediate traitor blend between the two homozygous case
Incomplete dominance
From whom are inherited traits transmitted?
They are transmitted form parents
Where do the differences among species finally reside?
In the genes
What form each chromosomes?
is formed by genes
What is form the genes?
for DNA
What is te mean DNA?
Deoxyribonucleic acid
What is the mean Biodiversity?
Is the variety of life in the world or in a particular habitat or ecosystem.
Who propose the Theory of Evolution ?
Charle Darwin
How a scientific theory can be confirmed?
By through observation and experimentation
WHat propose Darwin?
Darwin´s hypotosis says that diversity of organism is the result of the evolution.
What is the main mechanism of evolution?
The natural selection
Allows the stronger organism to survive in a given enviroment
The natural selection
________ provide some improved functions through the evolution of a trait
The Adaptations
There are three evolution mechanisms?
1-Variation.
2-Natural Selection
3-Time
What produce genetic variation?
The mutation and recombination
What allow the natural selection?
-Allow the better-adapted organism to survive while other are eliminated.
When overproduction of offspring occurs?
When they have too many babies
What is the competition?
Is when several species may depend on the same resources.
The environmental changes includes two aspects:
1.-One refers to changes, such as lack of food.
2.-The other is that these changes lead to evolutionary adaptations
