INDEPENDENT WORK of the STUDENTS

Date: 2015-10-07; view: 383.

THEORETICAL QUESTIONS NECESSARY FOR ACHIEVING of the PRACTICAL CLASSES

ORGANIZATIONAL STRUCTURE of the PRACTICAL STUDY

Effect of position

The role of many genes (polygenic inheritance) in production of a continuum of phenotypes.

Effect of position means that the expression of one gene is depended of other not allelic gene. Moreover these genes must inhere in nearby locuses of one chromosome. For instant proteins of Rh-factor are synthesized under the control of tree pairs of not allelic genes D, C, E and d, c, e. These genes are situated near each other in one chromosome. Persons CDE/cde and Cde/cDE have identify genotypes. But in case of the first combination produce a lot of E protein-antigen and a little of C protein-antigen, while in case of the second combination produce a lot of C protein-antigen and a little of E protein-antigen.

1. Multiple alleles.

2. Inheritance of blood groups.

3. Types of interaction of not allelic genes.

4. Complementary genes.

5. Epistasis. Types of epistasis.

6. Polygenic inheritance.

7. Effect of position. Inheritance of Rh factor

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

1. Rh-negative girl that has 0 group of blood and Rh-positive boy that has AB group of blood were married. The first their baby has B group of blood and Rh-negative. What is probability of birth children with A group of blood and Rh-negative?

2. Woman has myopia (dominant character), Rh-positive, and A group of blood. A child born by she has normal eyesight, Rh-negative, and 0 group of blood. Father has characters like mother's characters. What are the genotypes of mother and child? Define the genotype of the father.

3. It^'s necessary presence of two dominant genes D and E for normal hearing. Gene D determines the development of auditory receptors and gene E determines the development of auditory nervous. Parents are deaf, but their children have a normal hearing. What are the genotypes of all members of the family? What is the type of interaction of two dominant allelic genes?

4. Human skin color stipulate for dominant genes A and B, which interact for type of polygenic inheritance. People with genotype aabb have white color of skin. People with genotype AABB have black color of skin. Parents have one child with white color of skin and other child with black color of skin. Define the genotypes of parents? What are the possible genotypes of children?

5. Height of the people is controlled by several pairs of genes, which interact by type of polymeria (polygenic inheritance). In some population the shortest people have all recessive genes and height 150 sm. And the highest people have all dominant genes and height 180 sm.

1. Define height of people, which are heterozygous for three pairs of genes.

2. The woman with short height was married with man with middle height. In this family were born 4 children with height 150, 155, 160, 165 sm. Define the genotypes of parents and their height.

6. Mother and father have the 0 group of blood. Their daughter has B group of blood. Define the genotypes of parents and daughter. The phenomena of recessive epistasis take place.