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Human genetics
| Question | Answer |
|---|---|
| How many chromosomes are shown in a normal human karyotype? | 46 |
| Which of the following are shown in a karyotype? | All of the above |
| In humans, a male has | One x choromosme and one Y chromosome |
| Human females produce egg cells that have | One x chromosome |
| What is the approximate probability that a human offspring will be female? | 50% |
| What percentage of human sperm cells carry an X chromsome? | 50% |
| In a pedigree, a circle represents a | female |
| A pedigree can be used to | All of the above |
| Which of the following is caused by a dominant allele? | Huntington disease |
| Which of the following is caused by a dominant allele that expresses itself late in a persons life? | Huntington disease |
| Sickle cell disease is caused by a | Change in one DNA base |
| In cystic fibrosis, a change in a single gene causes the protein called CFTR to | fold improperly |
| Compared with normal hemoglobin the hemoglobin of a person with sickle cell disease | has a different sequence of amino acids |
| People who are heterozygrous for sickle cell disease are generally healthy because | they usually have some normal hemoglobin in their red blodd cells |
| Alleles found on the same chromosomes | are linked |
| The long stretches of repetitive dna in chromosomes 21 and 22 are unstable sites | that do not code for proteins |
| Most sex linked genes are located on | the X chromosome only |
| Colorblindness is more common in males than in females because | the allele for colorblindness is recessive and located on the X chromosome |
| Which of the following statements is true? | A colorblind boy received the allele for colorblindness from his mother |
| The failure of chromosomes to seperate during meiosis is called | nondisjunction |
| Because the chromsome contains genes that are vital for normal development no baby has been born | Without an x chromosome |
| Which of the following combos of sex chromosomes represents a female | XX |
| If nondisjunction occurs during meiosis | some gametes may have an extra copyof some genes |
| nondisjunction can involve | all of the above |
| the process of dna fingerprinting is based on the fact that | no two people except identical twins have exactly the same DNA |
| The human genome project is an attempt to | sequence all human DNA |
| The human genome was sequenced | by using computers to find overlapping regions between sequenced DNA fragments |
| The purpose of gene therapy is to | cure genetic disorders |
| which of the following is the first step in gene therapy? | Identifying the faulty gene that causes the disease |
| A_____ can be used to determine whether a person has inherited the normal number of chromosomes | karyotype |
| In humans, sex is determined by the X and ___ chromosomes | Y |
| If a couple has 5 boys, the probability that the next child will be a boy is____ | 50% |
| a _____ is a diagram that follows the inheritance of a single gene through several generations of a family | pedigree |
| A person who has blood type O can receive a blood transfusion only from a person who has blood type____ | O |
| People who have sickle cell disease inherited ____ copies of the sickle cell allele | two |
| A boy who has hemophilia inherited the disorder from his ___________ | mother |
| the process of ______________ replaces a faulty gene with a normal working gene | Gene therapy |
| In a human karyotype what are the chromosomes in each numbered group called? | Homologous chromosomes |
| How are the chromosomes that make up each ordered pair similar? | IN shape and size |
Created by:
maddydogking
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