One hypothesis about the inheritance of handedness is that two genes are involve

Question

One hypothesis about the inheritance of handedness is that two genes are involved. L-produces left cerebral language dominance and Il yields right. C-causes the favored hand to be contralateral to the language dominant hemisphere, while produces ipsilateral (sam side) dominance. According to this hypothesis, which genotypes would be left-handed? estion 13 yet answered oints out of 1.00 Flag question Select one or more a, cc 11 Quession 14 Not yet answered Ports out of 100 P Flag question Give an example of a genotypes that would permit two left handed parents to produce only right handed children. (give your answer in the format xxyyand xy) Ouesion 15N Nondisjunction can occur at either the first or second division of meiosis. XXY individuals arise from Not yet answered nondisjunction at themelotic division in the Points out of 1.00 P Flag queston Select one a. first, mother o b second, mother MacBook Air 0 F8 F1O 3 5

Explanation / Answer

Answer 11. Women have Hr / hR genotype . Therefore , her two sons are colour blind with normal blood clotting and two have normal vision and hemophilic. Both are X linked genes.

XHr XhR. x XY

Here XHrY, XhRY. Denotes this two phenotype.

Answer 12. A women whose mother is colour blind and father is hemophilic means

Mother genotype XHr XHr

Father genotype XhR Y

Cross between these parent produce daughter with the genotype

XHrXhR

When women with this genotype crossed , produce no son with normal phenotype. There is zero percent probability that a women produce son that have normal vision and normal blood clotting.

Ans 13 C-ll . Handedness is complex behaviour that influenced by multiple factor including genetics, environment and chance. Left hemisphere control right hand and right hemisphere control left side body movement. Here, right hemisphere language dominance encode by ll gene and C gene favoured hand to be contralateral to the hemisphere. So ans is C-ll.

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