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Gametes are made by meiosis, in which chromosomes make an exact copy of themselves. Remember, there are 2 chromosomes (1 from mum, 1 from dad) in each pair and these chromosomes swap genes randomly, which causes variation in gametes so offspring are different to each other and their parents. Fertilisation is also a random process - there are thousands of egg and sperm cells which could form a zygote and it is random which egg and sperm cells actually do. Offspring may also be born with a mutation (could be beneficial or harmful) which causes variation.
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Why does natural selection depend on variations and DNA?
The variations in the DNA are responsible in differences between desirable traits and unwanted traits. Mutations also cause changes in the DNA.
What is the original source of all variations in heritable traits?
Mutation
Horses traits for basic colors and variations on those colors are inherited how?
Independently
Which of these was part of Charles Darwin's theory?
Genetic recombinations of DNA cause variations of genetic traits .
What is a polymorphic character?
" many bodies " traits. The three alleles for blood type is an example of this. Height/size is another example of this and many other variations in animal physiology are examples of this. Discrete traits, everybody has a heart, are in contrast to this, but even in discrete traits there are variations.
What are genetic traits?
Genetic traits are variations of features passed on to offspring from there parents.
Which of these humans traits is altered by variations in environment?
height
Can mutations increase the variations in a species' traits?
Yes
Which of the traits is altered by variations in the environment?
Blood type
Why does natural selection depend on variations and DNA?
The variations in the DNA are responsible in differences between desirable traits and unwanted traits. Mutations also cause changes in the DNA.
What is the original source of all variations in heritable traits?
Mutation
What part of a dog is responsible for all the variations of traits in dogs?
The Owners
What are the differences in inherited traits between members of a species called?
variations
Horses traits for basic colors and variations on those colors are inherited how?
Independently
What variations do natural selection depend on?
They depend on natural variation in traits due to mutation.
Which of these was part of Charles Darwin's theory?
Genetic recombinations of DNA cause variations of genetic traits .
How helpful variations accumulate in a specie over time?
Helpful variations accumulate in a species over time by selecting those traits that allow it to better live in the environment it is in.
