In cats, pointed ears (E) are dominant to round ears (e), while black fur (F) is dominant to red (f). A cat with round ears and red fur is crossed with a completely heterozygous black cat with pointed ears.
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
In cats, pointed ears (E) are dominant to round ears (e), while black fur (F) is dominant to red (f). A cat with round ears and red fur is crossed with a completely heterozygous black cat with pointed ears.
The law of independent assortment states that two alleles having different traits assort into the gametes independently of one another. This assortment occurs during a dihybrid cross. A dihybrid cross has two pairs of contrasting characters that assort independently in the F2 generation. The dominant allele always masks the effect of a recessive allele and shows its phenotype. The dominant allele is denoted with a capital letter. The recessive allele can never show its phenotype in the presence of a dominant allele. The recessive allele is always denoted with a small letter.
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