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8.4: Simple Inheritance. Mendelian inheritance refers to the inheritance of traits controlled by a single gene with two alleles, one of which may be completely dominant to the other. The pattern of inheritance of Mendelian traits depends on whether the traits are controlled by genes on autosomes or by genes on sex chromosomes.
- Genetics
- Reproduction
- Other animals
Genetic variation is important because when conditions change (food becomes scarce, environment changes), some individuals in a population will be more likely to have variations that will allow them to survive. Those who reproduce pass their genes to the next generation. Variation helps species survive, and it's the reason species change over time....
In asexual reproduction, variation comes mainly from mutation. Mutation is a natural process that introduces permanent changes in a DNA sequence. However, microbes also acquire genetic variation through transformation, transduction, and conjugation (gene transfer). These mechanisms often come into play when conditions are harsh. In sexual reproduct...
Other living things have sex chromosomes too. Birds and reptiles have Z and W sex chromosomes. Unlike with X and Y, males have two Z chromosomes, and females have one Z and one W. Some insects and a few mammals have only an X chromosome. Females have two copies and males have one. However, sex is not always determined by chromosomes. With alligator...
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- Discovery of DNA as the genetic material. DNA as the "transforming principle" Hershey and Chase: DNA is the genetic material.
- Structure of DNA and RNA. Introduction to nucleic acids and nucleotides. The discovery of the double helix structure of DNA.
- DNA replication. Semi conservative replication. Mode of DNA replication: Meselson-Stahl experiment. Leading and lagging strands in DNA replication.
- Transcription and RNA processing. DNA replication and RNA transcription and translation. Central dogma of molecular biology.
Inheritance is when a living thing reproduces and passes on genetic information to its offspring. This film explains how inheritance works in humans, animals and plants. The film also explores how ...
- Chromosomes. Have we got some special traits for you in this lesson! Learn. Chromosomes and genes. (Opens a modal) Chromosome pairs.
- Genes, proteins, and traits. Which gene controls the "unbelievably charming" trait? And why do I have so many of 'em? Learn. (Opens a modal)
- Mutations. MUTANTS ARE AMONG US. Like cold viruses and corn and stuff. Learn. (Opens a modal) Practice. Apply: mutations Get 3 of 4 questions to level up!
- Activity: why do some mutations cause genetic disorders? Make science come alive in your classroom with free hands-on investigative activities aligned to middle school NGSS standards.
When living things reproduce they pass on characteristics to their offspring. This is known as inheritance. You’ve probably noticed that you might look like your parents. This is because you ...
Genes are pieces of hereditary material that are passed from parents to offspring. Genes are part of cell structures called chromosomes. In multicellular organisms, chromosomes are found in the nucleus of the cell. Each of these chromosomes contains one, long molecule of DNA, or d eoxyribo n ucleic a cid.
