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Down’s syndrome is caused by_________________ and the risk of conceiving an offspring with Down’s syndrome rises dramatically with the age of the ___________.

Huntington’s disease is caused by a dominant allele. If one of your parents has the disease, then the probability that you, too, will have the disease is ___________%.

Nondisjunction is uneven distribution of chromosomes in meiosis. It causes aneuploidy and most aneuploidies cease developing as embryos.

Cri-du-chat syndrome is associated with a missing chromosome number 5.

Give at least three differences between prokaryotic and eukaryotic cells. Also give  twoexamples of each type.

Every person has two copies of each gene, one inherited from each parent.

 An individual with the chromosomal description 45, X would be a _____.     

Mutations that cause loss of a chromosome would be termed:  

Fragile X syndrome is a genetic condition that causes a range of developmental problems including learning disabilities and cognitive impairment. Usually, males are more severely affected by this disorder than females because:  

A ________________ cross involves organisms that are heterozygous for a single character, whereas a ______________cross involves organisms that are heterozygous for two characters.