Pearson Biology Final Exam Questions Correct Verified Answers Updated.

What percentage of human sperm cells carry an X chromosome? - Ans50% How many chromosomes are shown in a normal human karyotype? - Ans46 Which of the following statements are true: -females cannot have hemophilia -a colorblind boy's mother must carry the gene for color-blindness -a sex-linked allele cannot be dominant -a colorblind boy's father must carry the gene for color-blindness - Ansa colorblind boy's mother must carry the gene for color-blindness Which of the following form(s) a Barr body: -one of the Y chromosomes in a male cell -one of the X chromosomes in a male cell -one of the X chromosomes in a female cell -both of the X chromosomes in a female cell - Ansone of the X chromosomes in a female cell Which of the following pairs of genotypes result in the same phenotype for Blood Type in Humans: -IA IA and IA IB -IB IB and IB i -IBIB and IA IB -IB i and ii - AnsIB IB and IB i Compared with the normal hemoglobin, the hemoglobin of a person with sickle cell disease is - Ansless soluble so they clump together and form odd shaped cells People who are heterozygous for sickle cell disease are generally healthy because they - Anshave some normal hemoglobin in their red blood cells if nondisjunction occurs during meiosis: - Ansgametes may have an extra copy of a chromosome Color-blindness is more common in males than females because - Ans the allele for color-blindness is recessive and located on the X chromosome If the allele for having a white forelock is dominant, family members WITHOUT a white forelock are - Anshomozygous recessive Which of the following is caused by a dominant allele for a protein found in brain cells: -Huntington's disease -color-blindness -cystic fibrosis -sickle-cell disease - AnsHuntington’s disease Which of the following diseases and conditions does not appear until late in a person's life: -cystic fibrosis -sickle-cell disease -color-blindness -Huntington's disease - AnsHuntington’s disease In cystic-fibrosis, a change in a single gene causes the protein called CFTR to - Ansfold improperly Because the X chromosome contains genes that are vital for normal development, no baby has been born - Answithout an X chromosome