Inheritance Pattern of Maize Cob.

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Biology Practical Report

------Inheritance Pattern of Maize Cob

Introduction

In this experiment, 2 types of maize cobs are provided, which show 2 clear inherited characteristics, i.e. grain colour (purple or yellow) and grain shape (smooth or wrinkled).

Each grain is a fruit produced from a separate pollination. This means that each cob carries many individual offspring.

The aim of the experiment is to find out the pattern of inheritance of the two maize cobs by counting and scoring the offspring on them.

Result

 

Hypothesis

In the short maize cob, the ratio of the phenotypes is approximately 9 (purple round): 3 (purple wrinkled): 3 (yellow round): 1 (yellow wrinkled), which is a classic result in dihybrid cross.

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In this case, purple (T) is dominant to yellow (t) and round (R) is dominant to wrinkled (r).

Parents:

        Phenotype:        purple round                purple round

        Genotype:        TtRr                        TtRr

Offspring:

From the table, we can see that 9 of the offspring are purple round (TTRR or TTRr or TtRr or TtRR); 3 are purple wrinkled (Ttrr or TTrr); 3 are yellow round (ttRR or ttRr) and 1 is yellow wrinkled (ttrr).

In the long maize cob, the ratio of the phenotypes is approximately 1 (purple round): 1 (purple wrinkled): 1 (yellow round): 1 (yellow wrinkled), which is also a classic ...

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