Exam 5: Beyond Mendels Laws

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

In the context of linkage,the higher the LOD score,the closer are two genes.

Brittany and Jarod have been trying to have a second child for 10 years.They have one healthy child,but Brittany has had four early,spontaneous abortions.The most likely explanation for the many pregnancy losses is that Brittany and Jarod

In common English,"linkage" refers to one event that tends to occur when another does.In genetics,linkage has a precise meaning.It refers to the transmission of

Multiple alleles are common because

When researchers analyzed the remains of Tsar Nicholas II of Russia and his family,they found that the suspected Tsar and his living great-grandniece Xenia differed at nucleotide position 16169 in the mitochondrial DNA.Retesting the remains showed that for this site in the mitochondrial genome,the purported Tsar had thymine (T)in some samples and cytosine (C)in others.The most likely cause of this finding is 2-14-2013

Types of genetic markers include

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 highly abnormal brains and spinal cords.Marbles has one copy of a dominant _____ allele.2-14-2013

Genetic heterogeneity refers to mutations in different genes that cause the same symptoms.

The alleles that control which A,B blood group antigens appear on the surfaces of red blood cells are

A popular 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

Zuzu is a white cat.She is genotype Ww for the "white masking gene" that reduces the number of melanocytes (pigment-containing cells).As a result,her body makes pigment,but it cannot get into the cells where it would color the fur.Zuzu's white masking gene is _____ to the melanin pigment gene because it prevents full expression of the pigment.

A mitochondrial trait passes from

Hairlessness in dogs is inherited from a single dominant allele.Inheriting two dominant alleles is lethal for an embryo.Penelope,a hairless dog mates with Arnold,a dog with hair.The probability Penelope will have hairless puppies is

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

Mendel's results and conclusions were accurate but are seen differently today because we now realize that

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

LOD (logarithm of the odds)scores are used to indicate linkage between genes.A LOD score of _____ or greater is a strong indicator of linkage.

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

Different alleles that are both expressed in a heterozygote are