Ms. Wilson who is pregnant and believed to be a carrier of Tay-Sach’s Disease, an autosomal recessive disease. She would like your professional opinion regarding the likelihood of her son being born with this disease. Genetic analysis of her disease-free husband shows that he is heterozygous for this disease. Which of the following should you tell her? (QID 133806)
A. You have nothing to worry about because your husband is disease free.
B. Your child will almost certainly have the disease since you have the disease.
C. Your child has about a one-quarter percent chance of inheriting the disease.
D. Your child has a three-quarter percent chance of inheriting the disease and a 25%
chance of being a carrier of the disease.
The process that distinctively increases the genetic diversity of gametes by shuffling the genes between two paired chromosomes is called __________ and happens during ___________. (QID 133804)
A. disjunction, metaphase I
B. DNA replication, the S phase
C. crossing over, prophase I
D. interkinesis, telophase I
Vinblastine and vincristine are anticancer drugs used to treat breast cancer. These vinca alkaloids inhibit microtubule polymerization thereby preventing spindle fiber elongation and centromere attachment. Which type of cell division and during which phase do these drugs target? (QID 133803)
A. mitosis, telophase
B. meiosis, prophase
C. mitosis, metaphase
D. meiosis, anaphase
During the initiation of meiosis, the number of alleles for each gene at the beginning of Prophase I is ___________ and is titled ___________: (QID 133802)
A. 8, tetraploid
B. 4, diploid
C. 2, diploid
D. 1, haploid
Meiosis is a cell division process that results in the production of…. (QID 133801)
A. identical diploid somatic cells
B. identical haploid somatic cells
C. genetically diverse diploid gametes
D. genetically diverse haploid gametes