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Usually a man will contribute either an x chromosome

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Usually a man will contribute either an X chromosome to a child (resulting ina girl) or a Y (resulting in a boy). Occasionally, chromosomes will combine(or fail to) in an unusual way, resulting in a chromosomal abnormality. Forexample, babies withTurner’s syndromeare born with only a single Xchromosome in the spot usually occupied by the twenty-third pair. Turner’ssyndrome causes some physical characteristics, like shortness, webbed necks,and differences in physical sexual development. Babies born withKlinefelter’s syndromehave an extra X chromosome, resulting in an XXYpattern. The effects of this syndrome vary widely, but it usually causesminimal sexual development and personality traits like extreme introversion.Other chromosomal abnormalities may cause intellectual disability. The mostcommon type isDown syndrome. Babies with Down syndrome are bornwith an extra chromosome on the twenty-first pair. Some physicalcharacteristics are indicative of Down syndrome: rounded face, shorterfingers and toes, slanted eyes set far apart, and some degree of intellectualdisability.
Practice QuestionsDirections:Each of the questions or incomplete statements below isfollowed by five suggested answers or completions. Select the onethat is best in each case.1. Blindness could result from damage to which cortex and lobe of thebrain?visual cortex in the frontal lobe(A)visual cortex in the temporal lobe(B)sensory cortex in the parietal lobe(C)visual cortex in the occipital lobe(D)cerebral cortex in the occipital lobe(E)2. Paralysis of the left arm might be explained by a problem in themotor cortex in the frontal lobe in the left hemisphere.(A)motor cortex in the frontal lobe in the right hemisphere.(B)sensorimotor cortex in the temporal lobe in the left hemisphere.(C)motor cortex in the parietal lobe in the left hemisphere.(D)motor cortex in the occipital lobe in the right hemisphere.(E)
3. Deafness can result from damage to the inner ear or damage to whatarea of the brain?connections between the auditory nerve and the auditory cortexin the frontal lobe(A)connections between the auditory nerve and the auditory cortexin the temporal lobe(B)connections between the areas of the sensory cortex that receivemessages from the ears and the auditory cortex(C)connections between the hypothalamus and the auditory cortexin the temporal lobe(D)connections between the left and right sensory areas of thecerebellum(E)4. According to the theory of evolution, why might we call some partsof the brain the old brain and some parts the new brain?Old brain parts are what exist in very young children, and thenew brain develops later.(A)The old brain developed first according to evolution.(B)The old brain becomes more active as we grow older.(C)The new brain deals with new information, while the old braindeals with information gathered when we were children.

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Term
Spring
Professor
Jadie

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