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     • The genetic diagram shows all of the possible alleles for a particular characteristic. Dominant alleles are capital letters, while the recessive alleles are lower-case letters.
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   What is a pedigree diagram?

   • Pedigree diagrams can be used to show the pattern of inheritance of a genetic trait The pedigree diagram below traces the inheritance of albinism through several generations. Albinism affects the production of the pigment melanin leading to lighter hair, skin and eyes. Using the pedigree chart, deduce and explain the following: Question 1

   2.4.4 Pedigree Diagrams | Edexcel A (SNAB) A Level Biology Revision

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   What is a vertical inheritance pattern?

   • Thus, every affected individual must have an affected parent and the trait often appears in every generation; this pattern is often called a vertical inheritance pattern, as in from top to bottom of the pedigree. A pedigree with affected individuals in every generation is typical of autosomal dominant diseases.

   4.3: Pedigrees | Biology LibreTexts

   bio.libretexts.org/Courses/Clinton_College/BIO_300:_Introduction_to_Genetics_(Neely)/04:_Inheritance/4.03:_Pedigrees

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   What is the difference between inheritance and Gene?

   • Inheritance is the process of passing genetic information to offspring. Genes are sections of DNA that code for a protein. Inheritance of genes can be shown in Punnett square diagrams. of an organism is the entire genetic material of that organism. The sequence of letters in the human genome has been determined, but research is still ongoing.

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   How do you determine if a chart shows autosomal or sex-linked traits?

   • Determine if the chart shows an autosomal or sex-linked (usually X-linked) trait. For example, in X-linked recessive traits, males are much more commonly affected than females. In autosomal traits, both males and females are equally likely to be affected (usually in equal proportions). The diagram shows the inheritance of freckles in a family.

   4.3: Pedigrees review - Biology LibreTexts

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   What is a pedigree consistent with autosomal dominant inheritance?

   • Figure 4.3.3 4.3. 3: A pedigree consistent with autosomal dominant inheritance. (Original-Deyholos-CC:AN) Diseases that are inherited in an autosomal recessive pattern require that both parents of an affected individual carry at least one copy of the disease allele.

   4.3: Pedigrees | Biology LibreTexts

   bio.libretexts.org/Courses/Clinton_College/BIO_300:_Introduction_to_Genetics_(Neely)/04:_Inheritance/4.03:_Pedigrees

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   How do you answer questions about pedigree charts for genetic diseases?

   • When answering questions about pedigree charts for genetic diseases, it is always useful to remember which phenotype is caused by the homozygous recessive genotype. You can write these genotypes onto your chart and it will give you a good starting point for working out the possible genotypes of the rest of the individuals in the chart.

   2.4.4 Pedigree Diagrams | Edexcel A (SNAB) A Level Biology Revision

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3. www.savemyexams.com › 2/4/4-pedigree-diagramsPedigree Diagrams | Edexcel A (SNAB) A Level Biology Revision ...

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   Revision notes on 2.4.4 Pedigree Diagrams for the Edexcel A (SNAB) A Level Biology syllabus, written by the Biology experts at Save My Exams.

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5. www.sciencelearn.org.nz › resources › 208-meiosisMeiosis, inheritance and variation — Science Learning Hub

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   During meiosis in humans, 1 diploid cell (with 46 chromosomes or 23 pairs) undergoes 2 cycles of cell division but only 1 round of DNA replication. The result is 4 haploid daughter cells known as gametes or egg and sperm cells (each with 23 chromosomes – 1 from each pair in the diploid cell). At conception, an egg cell and a sperm cell ...

6. www.bbc.co.uk › bitesize › guidesSample exam questions - inheritance, variation and evolution ...

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   The diagram shows the DNA fingerprints of a child, the child’s mother and two men who claim to be the child’s father. The numbers refer to the bars on the DNA fingerprints.

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8. www.bbc.co.uk › bitesize › guidesFamily trees - Inheritance - AQA Synergy - GCSE Combined ...

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   Inheritance is the process of passing genetic information to offspring. Genes are sections of DNA that code for a protein. Inheritance of genes can be shown in Punnett square diagrams.

9. www.bbc.co.uk › bitesize › guidesSample exam questions - inheritance, variation and evolution ...

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   Use one genetic diagram to show the inheritance of the polydactyly gene by R and S. [4 marks] Tip - use the family tree, it is there to help you. Read the key, work out who is affected and...

10. bio.libretexts.org › Courses › Clinton_College4.3: Pedigrees - Biology LibreTexts

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    Pedigrees are diagrams that show the phenotypes and/or genotypes for a particular organism and its ancestors. While commonly used in human families to track genetic diseases, they can be used for any species and any inherited trait.

11. bio.libretexts.org › Bookshelves › Genetics4.3: Pedigrees review - Biology LibreTexts

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    Dec 13, 2021 · The diagram shows the inheritance of freckles in a family. The allele for freckles (F) is dominant to the allele for no freckles (f). At the top of the pedigree is a grandmother (individual I-2) who has freckles.