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Inheritance

AQA GCSE Biology - B1.7.1
by

Peter Fearon

on 31 October 2013

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Transcript of Inheritance

Learning Objective
To explain why plants and animals
are similar to their parents
To recap our understanding of
the genetic features of cells
Inheritance
Key Terms:
Genes
Chromosomes
Characteristics
Nucleus
Gametes
Alleles
Why do we look like
our parents?
Inheritance:
...the process by which offspring recieve the genetic information that determines certain characteristics from their parents.
What do we inherit
from our parents?
A Pair of Chromosomes
In a human cell
46 chromosomes
23 pairs
Chromosomes are like blueprints.
They contain all of the (genetic) information passed to you from your parents.
Chromosomes
long chains of DNA containing some of the genetic information of an individual
A Gene
a short section of DNA found on a chromosome that codes for a characteristic (eg. hair colour)
Alleles
a pair of genes that code for a characteristic (eg. eye colour), one gene from the mother, one from the father
What do we inherit
from our parents?
hair colour
blood type
eye colour
ear lobes
These are all passed between mother and father at fertilisation
sperm
ovum
gametes
Characteristics
Distinguishing physical features.

Not all characteristics are genetic - some are influenced by the environment.
Lets take a look inside the cell
Nucleus
To bring it all together....
Why are we similar to our parents?
...half our genetic information comes from each parent (in the gametes).
...the combination of genes from
our parents (alleles) determine what
we look like
Sometimes it is a combination of different genes that control characteristics
Dear Darwin
Write a short letter to Charles Darwin. Explain to Darwin your discovery of how we inherit characteristics from our parents.
Higher:
Offspring look similar, but
not
identical to their parents.
Why?
Full transcript