MiscPedigree and DiseaseGenetics Simple

GeneticsDNA

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If a body cell of a chimpanzee contains 48 chromosomes, a gamete produced by a chimpanzee will contain how many chromosomes?  A.24 chromosomes  B.36 chromosomes  C.48 chromosomes  D.96 chromosomes 

What is a result of crossing over during meiosis?  A.genetic variation   B.extra chromosomes formed  C.loss of chromosomes  D.production of gametes 

Why does meiosis promote genetic variability?  A.Meiosis undergoes one cell division producing diploid cells.  B.Meiosis undergoes one cell division producing haploid cells.  C.Meiosis undergoes two cell divisions producing diploid cells.  D.Meiosis undergoes two cell divisions producing haploid cells. 

A new mutation that occurs in which type of cell can be passed on to offspring?   A.blood cell  B.nerve cell  C.brain cell  D.egg cell  

Some people carry a mutated allele of a particular gene that makes them resistant to HIV infection and AIDS. Which best describes this type of mutation?   A.beneficial   B.asexual   C.harmful   D.unicellular  

Tay-Sachs disease is a lethal, autosomal recessive genetic disorder. If both parents are heterozygous carriers of the disease, what are the chances of them having a child who is also a heterozygous carrier for Tay-Sachs?  A.25%   B.50%   C.75%   D.100%  

A mother carries one allele of a recessive gene for a disease on an autosome, and the father carries no recessive alleles of the gene for that disease. What is the likelihood of their child having the disease?   A.0%  B.50%  C.75%  D.100%  

Which is NOT true

a.Enzymes are reusableb.Enzymes can only work at

a specific pHc.Enzymes work best at extremely high temps

d.Enzymes are very specific to the type of reaction they

catalyze

Tall plants are dominant to short plants. What is the outcome if two short plants are crossed?   A.all tall plants   B.all short plants   C.half tall plants, half short plants   D.tall plants, short plants  

A man who has a genotype, Aa, marries a woman with the genotype, AA. What is the probability that their offspring will have the genotype, Aa?   A.25%  B.33%  C.50%  D.75% 

Flower color in snapdragons is controlled by a single pair of alleles.

Snapdragon Cross   Male Parent - 1 plant with red flowers 

Female Parent  -1 plant with white flowers Offspring  -300 plants with pink flowers 

Which of these is the best description of the action of these alleles in the cross shown?   A.incomplete dominance   B.double recessive   C.recombination   D.mutation  

Scott was looking at the results of a cross between red and white flowers. Which is the most likely result of a cross that demonstrates incomplete dominance?   A.0% pink flowers   B.25% white flowers   C.50% red flowers   D.100% pink flowers  

Which represents the probability a child will have type B blood if the mother is type AB and the father is type O?  A.0%  B.25%  C.50%  D.75% 

What is the chance of two parents with blood types AB and O producing an offspring with blood type O?   A.0%   B.25%   C.50%   D.75%  

Why are sex-linked traits more common in males than females?   A.Males have two X chromosomes, and sex-linked recessive traits are expressed by inheriting only one recessive gene.  B.Females have two X chromosomes, and sex-linked recessive traits are expressed by inheriting only one recessive gene.   C.Males have only one X chromosome, and sex-linked recessive traits are expressed by inheriting only one recessive gene.   D.Females have only one X chromosome, and sex-linked recessive traits are expressed by inheriting only one recessive gene. 

The pedigree below represents a sex-linked trait in four generations of a family.  Which human genetic condition could best be identified using this pedigree? A.PKUB.HemophiliaC.Cystic FibrosisD.Huntington’s Disease

 

This is a pedigree chart for Phenylketonuria.

Which statement best explains the inheritance of Phenylketonuria (PKU) by individual III-7? A.inherited as a dominant allele B.inherited as a sex-linked allele C.inherited from both parents who are carriers of the recessive allele D.inherited as a natural mutation because neither parent had the recessive allele 

Cystic fibrosis is a lethal, autosomal recessive genetic disorder. Which statement best explains how cystic fibrosis is maintained in the gene pool?  A.Organisms that are heterozygous can pass on only the dominant allele.  B.Organisms that are homozygous-dominant pass on either dominant or recessive alleles.  C.Organisms that are heterozygous can pass on either dominant or recessive alleles.  D.Organisms that are homozygous-recessive pass on only the dominant allele.  

Which best explains why hemophilia is more common in males than in females?   A.Hemophilia is caused by a dominant allele.  B.Hemophilia only occurs in the presence of male hormones.  C.The hemophilia allele is located on the X chromosome, and males have only one X chromosome.  D.The hemophilia allele is located on the Y chromosome, and females do not have a Y chromosome. 

The pedigree below represents a sex-linked trait in four generations of a family.  Which human genetic condition could best be identified using this pedigree?  A.PKU  B.Hemophilia  C.Cystic Fibrosis  D.Huntington’s Disease 

DNA mutations as a result of tobacco use can lead to which condition? A.PKU B.diabetes C.skin cancer D.lung/mouth cancer 

If two parents, one with blood type O and one with blood type AB, have a child, what is the chance the child will have the same phenotype as one of the parents? A.0% B.25% C.50% D.100% 

Alex has blue eyes, and both of his parents have brown eyes. What can most likely be concluded about Alex’s parents?  A.His father has the recessive blue eye characteristic.  B.His mother has the recessive blue eye characteristic.  C.Both of his parents have recessive blue eye characteristics.  D.Neither of his parents have the recessive blue eye characteristic. 

Biologists have found that a form of deafness is a recessive trait in dogs. If a female dog that is heterozygous for the trait mates with a male dog that is deaf, what percent of their offspring will be deaf?   A.100%   B.50%   C.25%   D.0%  

Which represents the probability a child will have type B blood if the mother is type AB and the father is type O? A.0% B.25% C.50% D.75%