Laboratory Exercise No. 6

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Name: Janafae D. Mallorca Course subject: Zoology 1101

Laboratory Exercise No. 6

Genetics

INTRODUCTION

Genetics is the study of heredity in general and of genes in particular. It is one of the

central pillars of biology starting from the civilization of humankind has recognized the

influence of heredity applying its principles to improve society such as the Babylonian tablets

showing pedigrees of horses and indicates its possible inherited characteristics. Genes is the

fundamental unit of heredity which are made up of the chemical substances called the

deoxyribonucleic acid or DNA. Gregor Mendel is known to be the father of genetics which made

his studies on peas as the basis for the development of the present understanding of heredity.

MATERIALS AND METHOD

A. Materials

● Data from classmates

B. Procedure

1. Determine which of the following traits are dominant and which are recessive by making

a statistical survey of the following traits in the class.

Traits Number of Students Proportion

Attached earlobes 30 69.77%

Unattached earlobes 13 30.23%

Right-handed 35 81.4%

Left-handed 8 18.6%

Ability to roll tongue 35 81.4%

Inability to roll tongue 8 18.6%

Curly hair 15 34.88%

Straight hair 28 65.12%

With 10 fingers 43 100%

With 11-12 fingers 0 0%

2. Solve the following problem.

In fruit flies, gray is dominant over black. If a purebred gray fruit fly crosses with

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a black fruit fly, what percent of the offspring will be gray?

– Using the method of the punnett square we are able to derive results of

100% of offspring colored gray (phenotype) however genetically

heterozygous (genotype).

G G

g Gg Gg

3. The law of probability states that the chance of simultaneous occurrence of two or more

independent events is equal to the product of the probabilities that each will occur

separately. Thus, when a coin is tossed in the air, and allowed to land, it will most likely

land as a “head” or “tail” of which the probability of the head or tail is one in two, or one

half in either case. Obtain a peso coin and toss it in the air 100 times. Record the result in

the table below.

Class Tally Total

Heads IIIII-IIIII-IIIII-IIIII-IIIII-IIIII-IIIII-

IIIII-IIIII-I

Tails IIIII-IIIII-IIIII-IIIII-IIIII-IIIII-IIIII-