Characteristics that help a species survive are mainly transmitted from one generation to the next through genes (the genetic code) passed from parents to offspring during reproduction.

Quick Scoop

Core Idea (the exam-style answer)

The characteristics that suit a species for survival are transmitted:

Through the genetic code inherited from our parents.

In other words, DNA in the sex cells (sperm and egg) carries genes that code for traits. When parents reproduce, these genes are combined in the offspring, so helpful traits can appear again in the next generation.

Mini Breakdown: How This Works

  • Traits live in genes
    • Traits (like fur thickness, beak shape, camouflage color) are determined by genes located on chromosomes in DNA.
* Each gene has different versions (alleles) that can lead to different forms of a trait.
  • Genes travel via reproduction
    • In sexual reproduction , offspring get half their chromosomes from each parent, so they inherit a mix of genes.
* Only traits encoded in genes (heritable traits) can be passed on and take part in evolution.
  • Natural selection keeps the useful traits around
    • If a trait helps an organism survive and reproduce (for example, better camouflage from predators), that organism is more likely to have offspring.
    • Those offspring inherit the helpful genes, so over many generations the trait becomes more common. These survival-helping traits are called adaptations.

Beyond Genes: Extra Nuance (but genes are still central)

Modern biology also shows that there are additional layers of inheritance, though the basic school-level answer is still “genes/DNA”:

  • Epigenetic marks
    • Chemical changes on DNA can affect how genes are turned on or off and can sometimes be passed to offspring through sperm and eggs.
  • Learned behaviors and culture
    • Some animals transmit survival behaviors (like hunting techniques or migration routes) by learning from parents, which also helps survival across generations.

These add detail, but for most tests and basic biology, the key mechanism you’re expected to give is: traits that suit a species for survival are transmitted by the genetic code (genes in DNA) inherited from parents.

One-Sentence TL;DR

Characteristics that help a species survive are passed on when genes in DNA are inherited from parents during reproduction, and natural selection keeps the helpful versions in the population over generations.

Information gathered from public forums or data available on the internet and portrayed here.