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2 of 8© Boardworks Ltd 2009 Family resemblance Members of the same family often look similar. If the son and daughter have children of their own one day, will they also look like their parents? Which parent do these children look more like? Humans, like all organisms, inherit characteristics from their parents. How are characteristics passed on? Why do members of the same family look similar?
3 of 8© Boardworks Ltd 2009 Different versions of genes Chromosomes in a homologous pair contain the same type of genes that code for the same characteristics, such as eye color. Each different version of a gene is called an allele. Each chromosome in the pair, however, may have a different version of the gene. For example, the version of a gene on one chromosome may code for brown eyes, whereas the version of the gene on the other chromosome may code for blue eyes. allele for brown eyes allele for blue eyes
4 of 8© Boardworks Ltd 2009 Homozygous alleles If the alleles for a characteristic in a homologous pair are the same, the organism is said to be homozygous for that characteristic. What color eyes will these homozygous pairs of alleles produce? allele for brown eyes allele for blue eyes
5 of 8© Boardworks Ltd 2009 Heterozygous alleles The characteristic expressed by heterozygous alleles will depend on which allele is dominant and which allele is recessive. If the alleles for a characteristic in a homologous pair are different, the organism is said to be heterozygous for that characteristic. What color eyes will this heterozygous pair of alleles produce? allele for brown eyes allele for blue eyes ?
6 of 8© Boardworks Ltd 2009 Dominant or recessive? Dominant alleles are always expressed in a cell’s phenotype. Only one copy of the dominant allele needs to be inherited in order for it to be expressed. Dominant alleles (e.g. brown eyes) are represented by an upper case letter (e.g. ‘B’). The phenotype for a particular characteristic depends on which allele is dominant and which allele is recessive. Recessive alleles are only expressed in a cell’s phenotype if two copies of it are present. If only one copy is present, its effect is ‘masked’ by the dominant allele. Recessive alleles (e.g. blue eyes) are represented by a lower case letter (e.g. ‘b’).
7 of 8© Boardworks Ltd 2009 What eye color? The allele for brown eyes is dominant over the allele for blue eyes. The individual will have brown eyes, because the allele for brown eyes masks the allele for blue eyes. allele for brown eyes allele for blue eyes So, what color will the eyes be of an individual who is heterozygous for eye color?
8 of 8© Boardworks Ltd 2009 Inheritance terms
1 of 8© Boardworks Ltd 2007 Inheritance terms. Objectives Define key inheritance terms. Determine genotypes and phenotypes of the offspring of a monohybrid.
1 of 29© Boardworks Ltd 2011 Inheritance. 2 of 29© Boardworks Ltd 2011.
Genetics Key Terms Genetics- is the study of heredity. Heredity- is the passing of traits from parents to offspring. Trait- a characteristic like hair.
Living things inherit traits in patterns Parents and offspring are similar Characteristics (eye color, height, etc.) are also known as traits Some traits.
Heterozygous vs Homozygous. Pairs of alleles can be either heterozygous or Homozygous. An allele are a pair of genes (section of DNA).
Traits and Inheritance Have you wondered why you resemble the other people in your family?
For each characteristic you have two alleles; one from your biological mother and one from your biological father. A particular chromosome from your biological.
Unit 4-. The different forms of a gene An allele whose trait always shows up in the organism when the allele is present.
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?
Dominant and Recessive Dominance Table 3. Alleles sequence of DNA any of several forms of a gene determine the genotype (genetic constitution of an organism.
Definition of a gene A piece of DNA that can be found on a specific location on a chromosome. Code for traits.
Genetics Examples in real life Terms to know:
Regents Biology Genetics Why do we look the way we do?
What is the difference?. Vocabulary Heredity – passing of traits from parent to offspring Traits – the physical, social, and emotional qualities of.
Passing traits from parent to offspring.. Physical characteristics inherited by the offspring from the parents. Ex. Hair color Eye color Skin.
Heredity The study of the passing on of traits from parents to kids. Learn how and why physical and behavioral characteristics are passed on to from.
Chromosomes are made of DNA. Portions of DNA that code for a trait are genes. Homologous chromosomes have alleles (different versions) of the same genes.
Cells-Nucleus-Chromosomes-DNA-Genes The cells have nucleuses in them. The nucleus has chromosomes. The chromosomes have DNA. The DNA has genes.
Heredity: The study of genetics started with observations made by GREGOR MENDEL, a monk who noticed that pea plants passed certain traits from one generation.
© Boardworks Ltd of 36 KS4 Biology Inheritance.
Rollercoaster of Genes by Dr. Annette M. Parrott Sung to the tune Rollercoaster of Love.
INTRODUCTION TO GENETICS Ms. Wassum. Traits Traits are the different forms of a characteristic that you may exhibit Ex: Blue or Brown Eyes Traits are.
Genes Observable traits are the result of genes. – Genes are found on the chromosomes in our cells – Each observable trait is determined by two genes,
INTRODUCTION TO GENETICS Chapter 10. Genetics Genetics: the study of heredity Heredity: the passing of characteristics from parents → offspring Characteristics.
To Start: Turn to p What is a locus? 2.Why is the fruit fly often used in genetics? 3.Why are certain characteristics more likely to be inherited.
The life and work of Gregor Mendel Over seven years, Mendel experimented on more than 28,000 pea plants! Why were his experiments so successful? Pea.
Essential Question: How is the combination of genes important in determining the inheritance of biological traits? Standards: S7L3a. Explain the role of.
Variation and Inheritance National 5. Learning Outcomes Give examples of variation within species Describe how sexual reproduction maintains variation.
Gene Every human has a gene for eye color. Gene: A piece of DNA that codes for a protein.
Genetics = The study of heredity/how characteristics are passed from parents to offspring.
Genetics Vocabulary You need to know these!!!. TRAIT A distinguishing feature that a person has Examples: Brown hair Freckles Widow’s peak Blue Eyes.
Genetics. Mendel Studied pea plants. Traits: something passed from parent to child.
Inheritance Contents All about alleles Homozygous cross Using a test cross Co-dominance Heterozygous cross.
Unit 7 Genetics Study Guide. 1. Mitosis A type of cell division that results in two identical daughter cells with the same number and kind of chromosomes.
Genetics Notes Who is Gregor Mendel? Principle of Independent Assortment – Inheritance of one trait has no effect on the inheritance of another trait “Father.
#3 – List EACH trait you thought the Potato Head child would have: Eye Color Ear Color: Nose Color: Lip Color: Skin Color:
Predict and interpret patterns of inheritance Genetics Unit.
Punnett Squares C Kohn, Waterford WI. Genetics Genetics is the study of inheritance of genes. i.e. genetics is how traits are passed down from parents.
T G A C T T T C C C C G G A A A A A C T G A A A G G G G C C T T T T.
Aim: How do different combinations of genes control traits in an organism? Do Now: Where are genes found?
What is Genetics? Genetics is the scientific study of heredity.
Genetics and Heredity. Heredity The passing of traits from parent to offspring (children) Can be by sexual or asexual reproduction.
Organisms have thousands of genes, organized into chromosomes, which determine what the animal looks like and what it can do.
A physical characteristic like eye color.. A small part on a chromosome that controls a trait.
6.4 Traits, Genes, and Alleles KEY CONCEPT Genes encode proteins that produce a diverse range of traits.
Living Things Inherit Traits in Patterns. Parents and offspring are similar. We all have our own unique combination of characteristics. These are called.
Copy notes in binder. You will only have a limited amount of time to write each slide so, stay focused and write!
Essential Question: How does genotype determine phenotype?
Heredity The passing of traits from parent to offspring Traits: physical characteristics of an organism –Example: eye color, hair color, & height.
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