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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.
What else can I help you with?
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?
The original source of all variations in heritable traits is genetic mutations. Mutations are changes in the DNA sequence that can create new traits or alter existing ones, providing the basis for genetic diversity within a population.
Which of these was part of Charles Darwin's theory?
Genetic recombinations of DNA cause variations of genetic traits .
What is the study of inheritance triats called?
The study of inheritance traits is called genetics. It focuses on how traits are passed from parents to offspring through genes and how variations in genes contribute to different traits and characteristics in individuals.
How do variations work?
Variations in living organisms arise through changes in DNA during reproduction, resulting in differences in traits. These variations can be caused by genetic mutations, environmental factors, or a combination of both. Natural selection acts on these variations, leading to the evolution of populations over time.
What are genetic traits?
Genetic traits are variations of features passed on to offspring from there parents.
Where do variations in traits within a species originate from?
Variations in traits within a species originate from genetic mutations, environmental factors, and natural selection.
Can mutations increase the variations in a species' traits?
Yes
Which of these humans traits is altered by variations in environment?
height
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 part of a dog is responsible for all the variations of traits in dogs?
The Owners
What is the original source of all variations in heritable traits?
The original source of all variations in heritable traits is genetic mutations. Mutations are changes in the DNA sequence that can create new traits or alter existing ones, providing the basis for genetic diversity within a population.
What variations do natural selection depend on?
They depend on natural variation in traits due to mutation.
Why do different individuals of the same species exhibit variations in traits?
Individuals of the same species exhibit variations in traits due to genetic differences, environmental influences, and random mutations during the process of reproduction. These factors can lead to differences in physical characteristics, behaviors, and other traits among individuals within a species.
How do downstream and upstream genetics differ in their impact on inherited traits?
Downstream genetics refers to the genetic variations that directly affect an individual's traits, while upstream genetics refers to the genetic variations that influence the expression of downstream genes. Upstream genetics can have a broader impact on inherited traits by regulating the activity of downstream genes.
Which of these was part of Charles Darwin's theory?
Genetic recombinations of DNA cause variations of genetic traits .
