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Learn: Inheritance, Genetic Screening and Ethics
Edexcel A Level Biology SNAB A
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Welcome!Welcome to today's lesson on Inheritance, Genetic Screening and Ethics. Building on your knowledge of DNA structure, replication, and mutations, we'll explore how traits are passed down, how we screen for genetic conditions, and the ethical considerations involved.
What is Inheritance?Inheritance refers to the passing of genetic information from parents to offspring through DNA. DNA contains genes that determine traits, such as eye colour or susceptibility to certain diseases. This occurs during reproduction when gametes (sperm and eggs) combine.
Mendelian InheritanceGregor Mendel's experiments revealed that traits are inherited according to predictable patterns. He discovered dominant and recessive alleles, which influence whether a trait appears in an organism. For example, the allele for brown eyes (B) is dominant over the allele for blue eyes (b).
Quick check: If a parent has alleles Bb for eye colour, what is the phenotype?
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Genetic ScreeningGenetic screening involves testing individuals for specific genes or mutations that may cause disease. For example, screening for the CFTR gene can identify carriers of cystic fibrosis. This is often done before or during pregnancy to assess risks for the baby.
Genetic screening can identify mutations that cause diseases like {{blank0}}.
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Ethics of Genetic ScreeningWhile genetic screening provides valuable health information, it raises ethical questions. For example, screening could lead to decisions about pregnancy termination or discrimination against individuals with certain genes. Balancing medical advancements with ethical concerns is crucial.
Match the items on the left with their correct pairs on the right
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Review Time!Great work! You've learned about inheritance, genetic screening, and ethical considerations. Let's test your understanding with a few final questions.
Which of the following statements are correct? (Select all that apply)
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Match the items on the left with their correct pairs on the right
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The {{blank0}} allele determines the dominant trait, while the {{blank1}} allele may be masked.
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Well Done!You've completed the lesson on Inheritance, Genetic Screening, and Ethics. Keep exploring how genetics shapes living organisms and impacts important decisions in healthcare and society!
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