Exam 4: Single-Gene Inheritance

A very narrow pedigree,such as that for Egypt's Ptolemy dynasty,reflects

A heterozygote has

Jermaine and Shikia are healthy parents of three young children.The oldest two,Bethany and Amber,are healthy,and they are six and four,respectively.Their youngest child,Roscoe,was born with Peeling Skin Syndrome two years ago.Roscoe's skin constantly peels,and is red and itchy.If Jermaine and Shikia have another child,the probability that he or she will inherit the skin condition is

The original pedigrees,used in France in the fifteenth century,resembled

A severe disease that is inherited as an autosomal recessive trait is more likely to skip generations in a pedigree than an autosomal recessive trait that causes a harmless phenotypic variant because

Gregor Mendel is known for

The first filial generation resulting from a genetic cross is the _____ generation.

Mendel called physical units responsible for the inheritance of traits "elementen." The basis for his first law is that elementen

Which of the following analysis would be most effective in identifying a disease-causing gene variant inherited from a parent,or one that has arisen in the child?

Alleles are

Sickle cell disease is inherited as an autosomal recessive trait.The genotype of an individual with sickle cell disease is

Using the product rule,the probability that parents heterozygous for two traits (AaBb)produce an offspring homozygous recessive for the same two traits (aabb)is

A Punnett square displays

Destiny has distal symphalangism - her fingers and toes are stiff,with tiny nails.She looks it up and finds it is an autosomal dominant trait.Since her parents do not have it,she reasons that she is a new mutation.However,if she has children,each of them,assuming her partner does not have the condition,has a(n)_____ probability of inheriting the condition.

When Mendel crossed pure breeding peas having yellow seed color (YY)with pure breeding peas having green seed color (yy),all of the offspring had yellow seed color.These results mean that yellow seed color is the

Jerry is six years old.His sister Hanah has the autosomal recessive condition neuronal ceroid lipofuscinosis that affects learning and coordination.Their parents are healthy.The probability that Jerry is a homozygote for the wild type allele of the gene that causes the condition is 2-12-2013

Which of the following represents a monohybrid cross? 2-14-2013

An autosomal dominant trait

The phenotypic ratio expected from a dihybrid cross involving complete dominance is

Hillary is 8 years old and has neuronal ceroid lipofuscinosis,also known as Batten disease.It is autosomal recessive.She was fine until age five,when she began to lose her vision and stumble.She had learning difficulties in school and was diagnosed at age six.Hillary may only live into her twenties,experiencing dementia and seizures.Her younger brother Jaden,age six,is healthy,as are her parents.The probability that Jaden is a heterozygote is