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Genotype: The genetic constitution of an organism ­ describing the alleles
that an organism contains.
Phenotype: Observable characteristics of an organism.
Gene: A section of DNA (sequence of DNA bases) that determines a single
characteristic of an organism.
Locus: Location of the gene on chromosome is called the locus.
Allele: Different forms of the gene.
Dominant allele: The version of the gene which is expressed as a
Recessive allele: the condition in which the effect of an allele is apparent in
the phenotype of a diploid organism only in the presence of an identical
Diploid: where the nucleus contains two sets of chromosomes.
Haploid: where the nucleus contains one set of chromosomes.
Co-dominant: where both alleles of a genotype contribute to the phenotype.
Homozygous: where alleles of a particular gene are identical.
Heterozygous: condition in which the alleles of a particular gene are different.

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Monohybrid Cross:…read more

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Sex Inheritance and Sex Linkage:
Sex is determined by chromosomes not genes. Females have XX
chromosomes and males have XY chromosomes. Any gene carried on the X or Y
chromosome is said to be SEX-LINKED.
The Y chromosome is very small and contains few genes but the X chromosome
contains thousands of important genes, such as a protein for blood clotting and
muscle cells. Females have two copies of the X chromosome, they are diploid.…read more


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