Genetics Midterm Towb

Genetics Midterm Towb - BICD 100 Midterm 1A Section A00 Dr....

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BICD 100 Midterm 1A Section A00 Dr. Towb
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Directions: Read though ALL of the answers, and choose the ONE best answer. 1. A couple are both tested and found to be carriers of the cystic fibrosis gene (a recessive genetic disorder). What is the chance that they will have 2 girls that are both affected by cystic fibrosis? A. 1/16 B. 1/32 C. 1/64 D. 1/8 E. 1/4 2. The following pedigree represents the incidence of a recessively inherited form of kidney disease in a family. Determine the genotypes of individuals 1, 2, 3 and 4, respectively. A. AA; aa; A_: Aa B. aa; Aa; Aa; A_ C. Aa; AA; aa; A_ D. aa: aa; Aa; AA E. AA: aa: A_; Aa 3. The SRY region of the Y chromosome was translocated from a male’s Y chromosome to his X chromosome. This male mates with a normal XX female and passes his altered Y chromosome onto his first child. What would be the phenotypic appearance of the genitalia of this child (altered Y, normal X)? A. Female B. Male C. True Hermaphrodite (both male and female genitalia) D. Partial Hermaphrodite (genitalia appearing between that of normal male and female) E. No genitalia 4. In a male cell during meiosis the X and Y chromosomes are no longer lining up as a homologous pair on the metaphase plate. What region of the Y chromosome might be defective? A. The SRY Region B. The Pseudoautosomal region C. The Homolog region D. The Centromere region E. The Centrosome region 5. Which of the following statements about androgen insensitivity syndrome is true? A. Those with androgen insensitivity syndrome display a male phenotype despite having a female genotype. B. Those with androgen insensitivity syndrome have problems making testosterone. C. Androgen insensitivity syndrome is a nondisjunction problem. D. all of the above E. none of the above
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6. A certain species of plant can often be found in two true breeding varieties. One variety has red leaves that are large, and one variety has yellow, small leaves. When you cross these two varieties, all progeny (F1) have red, small leaves. Assuming that the genes for leaf size and color assort independently, what would be the phenotypic ratio obtained from self crossing the F1 plants? A. 9:1 B. 1:2:1 C. 9:3:3:1 D. 3:1 E. 1:1:1:1 7. What could be possible genotypes of the parental plants crossed in question 6 above? A. RRSs x YYss B. RRss x rrSS C. RrSS x rrss D. rrLL x YYSS E. RrLL x YYss 8. What is the probability of parents having six consecutive boys? A. (1/2) 6 B. 6(1/2) C. (1/2)(1/2) + (1/2)(1/2) + (1/2)(1/2) D. 1/6 E. 1/2 9. What is the probability of a mother giving birth to two boys and then a girl? A. (1/2)(1/2) + 1/2 B. 1/8 C. 1/2 + 1/2 + 1/2 D. 1/2 E. 2/3 10. Somehow, a man has produced 2 sperm that have an extra copy of chromosome # 22 and 2 sperm that are do not have chromosome 22. It is most likely that: A. non-disjunction occurred in metaphase of mitosis early in development B. non-disjunction occurred in anaphase II C. non-disjunction occurred in metaphase I
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Genetics Midterm Towb - BICD 100 Midterm 1A Section A00 Dr....

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