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Transcript
The Transfer of Genetic
Characteristics
Unit 3: Lesson 2
A chromosome is made up of deoxyribonucleic acid or DNA and
proteins. However, Only the DNA is the genetic material.
The genes that control a trait have two forms called alleles. Each trait
in a human such as the type of hair, is controlled by two alleles, the
dominant allele and the recessive allele.
An organism with two alleles that are exactly the same is called homozygote. An
organism that has two different alleles for a same trait is called heterozygote.
Genotype refers to the alleles that an individual receives during fertilization for a
particular trait. Phenotype refers to the physical appearance of an individual resulting
from the expression of a genotype.
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