INDEPENDENT WORK of the STUDENTS

Date: 2015-10-07; view: 452.

THEORETICAL QUESTIONS NECESSARY FOR ACHIEVING of the PRACTICAL CLASSES

ORGANIZATIONAL STRUCTURE of the PRACTICAL STUDY

1. Definition of genetics. Genetic Terms Heredity Variation gene, allele, homozygous, heterozygous, dominant, recessive, phenotype, genotype, Punnet squares, monohybrid cross, dihybrid cross and polyhybrid cross.

2. Laws of G.Mendel. The first low of G.Mendel. The genetics scheme.

3. Cytological bases of the first low of G.Mendel.

4. Laws of G.Mendel. The second low of G.Mendel. The genetics scheme.

5. Cytological bases of the second low of G.Mendel.

6. Laws of G.Mendel. The low of G.Mendel. The genetics scheme.

7. Cytological bases of the third low of G.Mendel.

8. Interactions of allelic genes.

9. Expression and penetration of genes.

10. Pleiotropy. Types of pleyotropy.

To acquisition of practical skills of using the genetic laws solve tasks.

Monohibrid cross.

1. Myoplegia inherit as dominant disease. What is the possibility of birth the child with myoplegia in the family, where mother is healthy, but father has myoplegia (heterozygous)?

2. In human being blue eye color is recessive to brown eye color. A brown-eyed man has a blue-eyed mother. What are the genotypes of this man and his mother? What are the possible genotypes of his father?

If this man get married a blue-eyed woman what are the possible genotypes of their offspring?

3. Tei-Sax disease inherit as recessive disease and, as rule, children die in 4-5 years. The first child died, when will be born the second child. What is the possibility, that the second child will be ill?

Dihibrid cross:

4. Glaucoma inherit of several ways: one of it^'s- dominant, others are recessive. Genes lie in different chromosomes.

What is the possibility of birth the child with glaucoma in family, where parents are diheterozygous?

What is the possibility of birth the child with glaucoma in family, where mother is diheterozygous and father has normal eyesight (homozygous for both pairs of the genes)?

5. In dogs, the barking trait is dominant over the silent trait and erect ears are dominant over drooping ears. What is the expected phenotypic ratio of the offspring when dogs heterozygous for both the traits are crossed?

6. In man brown eyes (B) are dominant to blue (b) and dark hair (R) dominant to red hair (r). A man with brown eyes and red hair, whose father was blue-eyed get married a woman with blue eyes and dark hair, whose mother was red-haired. They have four children. Give the genotypes and phenotypes of the parents and the children. What is the possibility of birth the child with blue eyes and red hair? penetance

Polyhibrid cross:

7. In man polydaktilia, syndrome of short fingers and glaucoma are dominant characters. What is the possibility of birth the children without these characters in family, where parents are triheterozygous?

Expression and penetance (penetration).

8. Retinoblastoma in children – dominant disease with penetance 90%. Mother in childhood have retinoblastoma, father is healthy. In family was born the child with retinoblastoma. What is the possibility of birth the second child with disease?

9. Podagra inherit as a dominant character. Penetance of the gene in man - 20%, in woman-0%. What is possibility be ill in podagra in family, where parents are heterozygous?

What is possibility be ill in podagra in family, where mother is healthy and father ill in podagra (heterozygous)?