Human Genetics Chapter 14

Down Syndrome is caused by 

• mitotic cell division in the brain
• multiple alleles in genes
• development of an unfertilized egg
• nondisjunction during meiosis

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Chromosomes 1-22 in a karyotype are also known as ______________.

• sex chromosomes
• autosomes
• barr bodies
• trisomy

The following picture is known as a ___________________.

• punnett square
• pedigree
• karyotype
• gamete

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Downs syndrome may result from 

• the presence of an extra chromosome
• the absence of a single chromosome in a zygote
• the mutation of a gene in a zygote
• failure of a chromosome to replicate in mitosis

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_______________ is a sex linked hereditary disease in which clotting factors are missing from the blood. 

• PKU
• Sickle Cell Anemia
• Cystic Fibrosis
• hemophillia

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The following is a __________________.

• a girl with Turner syndrome
• a girl with Downs Syndrome
• a boy with Turner Syndrome
• a boy with Downs Syndrome

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In an eukaryotic cell, DNA is primarily located in the ____________. 

• cytoplasm
• nucleus
• lysosome
• ribosome

Traits controlled by genes on the X-chromosome are called___________.

• autosomes
• sex-linked
• codominant
• incomplete dominance

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There are ____ as many chromosomes in gametes compared to body cells.

• twice
• half
• one third
• thrice

If T= normal and t= Tay Sachs Diseases, then what would be the genotype of individual E?

• TT
• Tt
• tt
• TS

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