From Mendel to DNA. Learning Objectives What did Mendel’s experiments teach us about inheritance? What are DNA fingerprints? How are specific proteins made in the body?. Carried out breeding experiments with peas. Used pure strains of: round, wrinkled, green and yellow peas .
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
What did Mendel’s experiments teach us about inheritance?
What are DNA fingerprints?
How are specific proteins made in the body?
Mendel suggested that there were separate units of inherited material. He realised some characteristics were dominant over others and that they never mixed together.
A gene is a section of DNA coding for a particular feature.
e.g. eye colour, attached/unattached ear lobes, ability to roll tongue.
DNA is a chemical that stores your genetic material.
Each base is like one letter in a four-letter alphabet.
These letters make up 3 letter groups called codontriplets.
Each triplet is one piece of information.
‘DNA fingerprinting’ – a technique that uses the unique patterns in your DNA to identify you.
Explain how DNA fingerprinting could be used to find out which one is the real father.
How is sex determined in humans?
Can you predict what features a child might inherit?
Humans have 46 chromosomes – 23 from the mother and 23 from the father.
The complexity of an organism does not seem to be correlated with the number of chromosomes it has.
Fruit fly – 8
Kangaroo – 12
Human – 46
Chicken – 78
Fern - 1200
In 22 cases each chromosome in the pair is a similar shape and has genes carrying information about the same things. But one pair of chromosomes may be different – these are the sex chromosomes.
Chromosomes from a male
A recessive characteristic will only be shown if an individual ishomozygous for the recessive allele.
Genetic diagrams are used to show possible outcomes of a particular cross. Dominant allele is shown by a capital letter, and a recessive allele by a lower case letter.