What are dominant and recessive alleles?

Slides:



Advertisements
Similar presentations
Title: B1 Revision.
Advertisements

B1 Revision – You and Your Genes
You and Your Genes Revision Lesson 2. What causes inherited diseases? Write: Huntington’s disorder and cystic fibrosis are inherited diseases. Huntington’s.
1 Punnett Squares Genetics and Diversity I. S Differentiate between dominant and recessive genes. Vocabulary & People GenotypePhenotype DominantRecessiveAllele.
Genetics The study of genes and the inheritance of traits This Powerpoint is hosted on Please visit for.
Genetics: The study of heredity. Heredity = the passing of traits from parents to offspring.
Year 10 – Genetics and Biotechnology (Biology) Genetic disorders.
Regents Biology Genetics Why do we look the way we do?
 What is genetics?  Genetics is the study of heredity, the process in which a parent passes certain genes onto their children. What does that mean?
You + Your Genes B1 Revision Notes. Individual Characteristics Features determined either owing to environment or inheritance. Examples? Variation amongst.
You and your Genes. By Helena Cowling.
Genetic Pedigree Diagrams. What are genetic pedigree diagrams? Show how an inherited trait (characteristic) runs in a group of related individuals. You.
Genetic Diseases L.O: To understand how some genetic diseases can be inherited Starter: list as many inherited diseases that you can think of.
B2 – Biology Inheritance Mr. P. Collins. B2.8 Inheritance - AIMS to explain why Mendel proposed the idea of separately inherited factors and why the importance.
Compare mitosis and meiosis Mitosis (nearly all cells)– chromosomes d……….., cell splits o…... into … cells, both have the s…… number of chromosomes at.
Bell Ringer A child is born with blue eyes even though BOTH his parents have brown eyes. How is this possible? Can two blue eyed parents have a brown.
Genetic Screening and Counselling
IB Inheriting genetic disorders © Oxford University Press 2011 Inheriting genetic disorders.
What are gametes and where do they form? Why was the importance of Mendel’s discoveries not appreciated until after his death? Define the following terms:
How is this possible?. Intro to Inheritance & Variation of Traits ___________________________.
B1 Smart Teach Foundation Session 3. Keywords Key wordDefinition NucleusPlace inside a cell that contains the DNA (chromosomes). DNAA molecule found in.
Organisation of genetic material Each chromosome in the nucleus contains thousands of genes.
Genetics: Inheritance. Meiosis: Summary  Diploid Cells (2n): Cells with two sets of chromosomes, (aka “homologous chromosomes”)  One set of chromosomes.
What is the genotype of this reebops? N= L= S = E = A = B = T = H = Could one of its parents have had 3 humps? Is it possible for both its parents to have.
What do you know? Meiosis & mitosis? Inheritance? Cystic Fibrosis? Polydactly?
May 4, What is an allele?. Genotype: genetics of trait (what alleles?) Homozygous: two copies of the same allele –Homozygous dominant (BB) –Homozygous.
Genetics Crash Course 7th grade science.
Reproduction and Genetics
“Frozen” HW check Have your homework out so we can check it.
Mendel and Monohybrid inheritance Describe the work of Gregor Mendel Describe monohybrid inheritance using punnett square diagrams.
A scientific method of making a woman pregnant, which does not involve sex. Conception occurs via sperm and egg being placed into a test tube.
The Chromosome Theory of Inheritance
B1 Revision – You and Your Genes
Genotype and Phenotype
Sex Determination Chromosome # 23 are sex chromosomes
Genetics and Heredity.
Genetics Notes Who is Gregor Mendel? “Father of Genetics”
Inheritance, Variation and Evolution
B2 Cell division: gametes, body, mitosis, once, repair, asexual, copied, growth, two, testes, twice, differentiate, four, fertilisation, gamete, genetic,
nheritance Alleles are different forms of a gene. They can be dominant or recessive. Genetic diagrams help us to understand the.
5 a day revision B1 – You and your genes What genes do
Genetics Definitions Definition Key Word
Genetics Vocabulary Name: ________
WHERE DID YOU GET YOUR GENES??
AQA GCSE INHERITANCE, VARIATION AND EVOLUTION PART 2
Lesson Starter How many chromosomes does almost all human cells have?
Genetics Vocabulary.
Genetics: Inheritance
B2b Revision Who was Mendel?
Punnett squares.
#49 Reebop Genetics Part 1.
Genetics Chapter 10—pages
Heredity and Probability
April 27, 2010 What is a karyotype?
WHERE DID YOU GET YOUR GENES??
Inheritance Make sure you revise: Mitosis - cell division
Genetics Notes Who is Gregor Mendel? “Father of Genetics”
Genetics: Inheritance
Genetics and Diversity
Inheritance Practice Test
Inheritance Practice Test
Chapter 10 assessment.
The study of genes and the inheritance of traits
The study of genes and the inheritance of traits
Aim: Genetics “Why do we look the way we do?
B6 Genetics- Paper2 Revision
B6 Genetics- Paper2 Revision
Mendelian Genetics Vocabulary.
Presentation transcript:

What are dominant and recessive alleles? ………………… allele controls traits/ features that only show when there is no dominant allele in your genotype ……………….. allele takes over control of a feature whenever it is in your genotype T = dominant (curly) t = recessive (straight) What do these reebops alleles code for? A a B b L l H h

Learning objectives today….. Can we predict phenotype from genotype? What is a “genetic diagram”? What is polydactyly and how is it inherited? What is CF and how is it inherited? What is embryo screening and is it right? What are stem cells and is it right to use them?

Allele Codes for Dominant or recessive? A a B b L H h

What is Jack & Sal’s genotype? Ann Ken Fifi Sal Jack Jade What is Ken’s genotype? What is Jack & Sal’s genotype? Who has Jack inherited his genotype from? What is Ann’s genotype? You have enough information to be certain What is Fifi’s genotype (you have enough information to be certain) Ann is pregnant. What is the chance that her next child will be a boy? Jack meets Jade. What is the chance they will have a curly tailed child?

What is Ken’s genotype? What is Jack & Sal’s genotype? Who has Jack inherited his genotype from? What is Ann’s genotype? You have enough information to be certain What is Fifi’s genotype (you have enough information to be certain) Ann is pregnant. What is the chance that her next child will be a boy? Jack meets Jade. What is the chance they will have a curly tailed child?

How can we predict what traits our kids might get? Mum’s genotype Dad’s genotype Possible genotypes of kids

Remember… Some genes have more than one version Different versions of a gene are called “alleles” Genotype Phenotype

Remember… Some genes have more than one version Different versions of a gene are called “alleles” Genotype Phenotype

? ? x Predict the chances of the couple having A blue eyed child A brown eyed child ? ? ?

? ? John Hannah x ? What is Hannah’s phenotype? (1 mark) What is the chance of Pete having blue eyes? (3 marks) What is the chance of Pete having Brown eyes? How could Pete have blue eyes when neither of his parents do? (2 marks) ? ? ? Pete

Polydactyly Condition caused by a dominant allele

Mum’s genotype d Dad’s genotype D

Cystic Fibrosis A disease of the cell membrane Caused by a recessive allele Can 2 “healthy” parents have a kid with CF? http://www.youtube.com/watch?v=Twjg7v-pTO4

Screening for genetic disorders This clip helps summarise the techniques used to screen for genetic disorders http://www.youtube.com/watch?v=nLNXar9HMC0 Some words to help you! Fertilised egg / zygote Blastomeres DNA Genetic disorders.

Advantages Disadvantages What are the advantages and disadvantages (social, economic and ethical) of embryo screening? Advantages Disadvantages Economic Social Ethical Jan 10 BLY2H Q5

Can stem cells really cure disease? What is a stem cell? Where do stem cells come from? What are stem cells used for? Is it right to use stem cells in research and medical treatments?

Zygote grows as cells divide by Mitosis In the early growth stages the embryo cells are unspecialised stem cells

What is a stem cell? An “unprogrammed” cell that can develop into ……………….. other type of cell. In the “right” conditions this cell could become a muscle cell In other conditions this cell could instead become a bone cell

Where do stem cells come from? What are stem cells used for? The best source of stem cells is ………………………………………………………… Human stem cells can also be found in adult’s ………………….. ………….. Stem cells can be programmed to develop (differentiate) into …………….type of cell. Stem cells could be programmed to become nerve cells and used to treat …………………………………… Anthony Atala LZ Clip discussing use of stem cells and ethics surrounding their use http://www.bbc.co.uk/learningzone/clips/stem-cell-research-and-medicine/6013.html