Exam 5: Beyond Mendels Law

Marbles is a Manx cat whose tail is so short that she appears not to have one.The genotype for short tail in Manx cats is heterozygous (Mm).Cats that are genotype mm have normal length tails,but cats that are genotype MM die before birth due to very abnormal brains and spinal cords.Marbles has one copy of a recessive _____ allele.

A and B are linked genes.A heterozygote for both genes would show which configuration if the genes are in cis?

Of nearly 200 forms of hereditary deafness,132 are autosomal recessive,64 autosomal dominant and 4 X-linked recessive.Hereditary deafness is therefore genetically

Mitochondrial disorders are probably very rare because

Types of genetic markers include

A man who has normal hearing and has a recessive deafness allele on chromosome 17 marries a woman who also has normal hearing and also has a recessive deafness allele,but this allele is on chromosome 3.The probability that their children will be deaf due to either of these mutated genes is closest to

Hairlessness in dogs is inherited from a single dominant allele.Inheriting two dominant alleles is lethal for the embryo.Ralph and Penelope are both hairless dogs.What is the probability that Penelope will give birth to a hairy puppy?

Epistasis and multiple alleles differ in that

Marfan syndrome can be caused by mutations in either of two genes,but mutations in one of the genes blocks activity of the other.This means that Marfan syndrome demonstrates

Different alleles that are both expressed in a heterozygote are

If allele T (long tongue)exhibits incomplete dominance over the recessive allele t (short tongue),a heterozygote for this gene would most likely have

Which of the following is an illness caused by a mutation in mitochondrial DNA?

Mitochondrial DNA differs from nuclear DNA in that it

A trait caused by an environmental influence that appears to be inherited is

Some combinations of recessive alleles cause problems so severe that the fetus ceases to develop.Such lethal allele combinations appear to alter Mendelian ratios because

The mitochondrial genome consists of ___ genes.

A widely-used research technique used to associate patterns of genetic variation with phenotypes that is based on the concept of linkage,but considering all of the chromosomes at once,is

Can a woman with blood type A have a child with blood type O with a man who is AB?

Multiple alleles are common because

Geneticists construct linkage maps of chromosomes by