Rationale
Individuals have different preference for the use of the hand. These hand preferences are right-handedness, left-handedness and ambidextrous which is the ability to do use the both hands in doing different tasks. The handedness of a person can be determined if the specific hand can do the task comfortably in situations like writing and throwing. The right-handedness of the people has approximately 85% in the society (Porac, 2016). Statistically, the right-handed are more dominant and common than left-handed which is fewer to individuals. The hand preference of handedness of an individual can be biological and most likely to be a genetic cause. There are many research and studies about the inheritance of left-handedness. These studies …show more content…
Each of the hemispheres has their different functions in our body. The right hemisphere of the brain is its creative side. The functions of right hemisphere of the brain are more on the visual and include some abilities such as face recognition and visual imagery. However, the left hemisphere of the brain is more on the understanding and using language such as speaking, listening and writing. This side of the brain focuses on the motor skills. From these ideas, it can be concluded that the left hemisphere of the brain controls the writing and fine motor skills which is somehow related to the hand preferences. However, the brain of a person is considered as cross-wired which explains that the right hemisphere of the brain controls the left side of the body, while the left hemisphere of the brain will control the right side of the …show more content…
(2000). Right, Left, Right, Wrong .
McManus, C. (1992). Theories of Handedness. right left right wrong .
Medland. (2006). Genetic factors of left handedness.
Pedigree Analysis
Left-handedness is a trait in which a person prefers to use the left hand in doing different task such as writing and throwing. Studies show that left-handedness can be passed from generation to generation and there are some percentages that a specific gene of a person can produce a left-handed progeny or offspring in the next generation.
The pedigree chart shows the inheritance of the trait left-handedness in four generations. The paternal side of the pedigree chart states that the first and second parents have the normal handedness or right handed. (McManus, 1992) states in his study on the Dextral and Chance Theory that the genotype DD will produce all right-handed offsprings, while the genotype DC will produce a 25% of left-handed and 75% of right-handed. Therefore, the heterozygous DC can also produce of left-handed offsprings in the next generation.
Paternal side: Parent 1 Parent 2 D
D
D
DD
DD
D
DD
DD
D
Individuals have different preference for the use of the hand. These hand preferences are right-handedness, left-handedness and ambidextrous which is the ability to do use the both hands in doing different tasks. The handedness of a person can be determined if the specific hand can do the task comfortably in situations like writing and throwing. The right-handedness of the people has approximately 85% in the society (Porac, 2016). Statistically, the right-handed are more dominant and common than left-handed which is fewer to individuals. The hand preference of handedness of an individual can be biological and most likely to be a genetic cause. There are many research and studies about the inheritance of left-handedness. These studies …show more content…
Each of the hemispheres has their different functions in our body. The right hemisphere of the brain is its creative side. The functions of right hemisphere of the brain are more on the visual and include some abilities such as face recognition and visual imagery. However, the left hemisphere of the brain is more on the understanding and using language such as speaking, listening and writing. This side of the brain focuses on the motor skills. From these ideas, it can be concluded that the left hemisphere of the brain controls the writing and fine motor skills which is somehow related to the hand preferences. However, the brain of a person is considered as cross-wired which explains that the right hemisphere of the brain controls the left side of the body, while the left hemisphere of the brain will control the right side of the …show more content…
(2000). Right, Left, Right, Wrong .
McManus, C. (1992). Theories of Handedness. right left right wrong .
Medland. (2006). Genetic factors of left handedness.
Pedigree Analysis
Left-handedness is a trait in which a person prefers to use the left hand in doing different task such as writing and throwing. Studies show that left-handedness can be passed from generation to generation and there are some percentages that a specific gene of a person can produce a left-handed progeny or offspring in the next generation.
The pedigree chart shows the inheritance of the trait left-handedness in four generations. The paternal side of the pedigree chart states that the first and second parents have the normal handedness or right handed. (McManus, 1992) states in his study on the Dextral and Chance Theory that the genotype DD will produce all right-handed offsprings, while the genotype DC will produce a 25% of left-handed and 75% of right-handed. Therefore, the heterozygous DC can also produce of left-handed offsprings in the next generation.
Paternal side: Parent 1 Parent 2 D
D
D
DD
DD
D
DD
DD
D