Topic: Medical genetics. Methods of studying human heredity.

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LESSON # 10

Topic: Medical genetics. Methods of studying human heredity.

Task№1 Describe what is the essence and possibilities of use methods:

1) biochemical________________________________________________________

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2) molecular genetic____________________________________________________

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3) clinical genealogical_________________________________________________

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____________________________________________________________________Task№2 The pedigree below tracks the presence of dimples through a family's generation.

Describe the pedigree

If individuals II-1 and II-2 have a fourth child, what is the probability that the child will have dimples?

Task№3 Determine the risk of genetically determined defects in children born in a closely related marriage.

To solve the problem, use the Wright-Kislovsky formula.

Task№4 Tanya and Natasha are sisters and both suffer from color blindness. They have a sister with normal vision and a brother with normal vision. Tanya and Natasha married healthy men on the indicated basis. Tanya had two girls who can distinguish colors normally, and two boys. Natasha has two sons. Determine the genotypes of Tanya and Natasha, their parents, the gender of their color-blind children. Shade the icons on the pedigrees in accordance with the solution (patients - solid shading, carriers - dotted).

Task№5 Fill the table

The Denver system of chromosome classification

Chromosome group	Chromosome numbers	Descriptions of the chromosomes

Task№6 Answer the questions

1. How is Patau syndrome diagnosed by the cytogenetic method?

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2. Turner syndrome is diagnosed with only one sex (X) chromosome in a pair. Calcium chromosomes in the patient's karyotype is 45.

А) At what stage of gametogenesis is the violation of the number of chromosomes in the unborn child?

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В) Name the stages of meiosis at which there is a violation of the number of chromosomes and the causes of these violations.

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