Homozygous pea plants with yellow seeds (dominant) with a smooth surface (dominant) with plants that have green (recessive) wrinkled (recessive) seeds.

Date: 2015-10-07; view: 476.

Consider the F2 generation from crosses of dumpy and ebony. In this case, you will find the splitting criterion, which led to the emergence of four groups: normal, dumpy, ebony and dumpy-ebony. Latest combine features of dumpy and ebony. Count the number of flies in each group. Check the conformity of the data obtained with the expected. To address the question of the validity of coincidence you should receive data with the theoretically expected producing of biometric processing the material by applying already known formula.

Consider the heterozygous progeny derived from crosses of dumpy and ebony. Compare them with the normal form. You make sure that the F1 of this cross did not differ from normal. This is because the signs of dumpy and ebony in hybrids crossed in heterozygous state and does not appear externally.

Consider the representative of the parent generation - ebony. For the characteristic dark ebony body. A mutant gene that caused the dark color is recessive.

Mutation of ebony. Magnifier

Consider the representative of the parent generation dumpy. Compare it with the normal fruit fly. Note the shortened wings. The length of their income until the end of the abdomen. Edges are not rounded and obliquely cut. The wings are changed - a recessive trait.

The body of normal flies - gray brown of about 3mm. Eyes bright red, are located on either side of the head. Wings flat at rest are located along the body, overlap one another, act on the length of the end of the abdomen about 1 / 3. Females are larger than males. Have wide, pointed at the end of the abdomen with a visible pigment rings. Males are smaller, have narrow abdomen, devoided of pointed end, pigmented ring fused at the end of the abdomen.

Subject: Analysis of the F2. Statistical processing of results using mathematical method. Getting the skills of writing a report on the results of studies.

Laboratory work №5

Objective: Introduction to report writing of the results of studies.

Drosophyla melanogaster

Mutation of dumpy. Magnifier

Analysis of the results of crossbreeding dihybrid dumpy and ebony in F1. Magnifier

Analysis of the results dihybrid crossing of dumpy in ebony F2. Magnifier.

Tasks