2. In cattle, males have mahogany and white spots and females have red and white spots. This illustrates a. Sex linked b. Sex limited C. Sex influenced d. Sex unrelated е. None of these

1. True or False, TT would be a homozygous recessive tall pea plant.

6. In humans, the gene for normal vision (B) is dominant to the gene for color blindness (b). Color blindness is a sex-linked trait. Which of the following would be the genotype for a colorblind male? xbxb xExb O W * REQUIRED DELL * REQUIRED U

1. What kind of mutations are most likely to cause genetic diseases? A. Mutations in somatic cells B. Mutations in proto-oncogenes C. Mutations in gamete cells 2. In pea plants, tall height is dominant over short. If two hybrid pea plants were mated, what fraction of their offspring would you expect to be tall? A. 1/4 B. 1/2 C. 3/4 D. 100% all of them

4. An observable, physical trait of an organism is known as a(n) A. Genotype B. Phenotype C. Allele D. Gamete

1.  A man and woman are both affected with the BRCA1 gene for familial breast cancer, a disease that has 80% penetrance in all individuals who carry the allele. They are both heterozygotes for the disease-causing mutation.  What is the probability that they will have a phenotypically normal child?a.  20%b. 40%c. 60%d. 50%e. 80% 2. In populations in Hardy-Weinberg equilibrium, the heterozygote frequency is maximal when the A allele equalsa 0b 0.2c 0.5 d 0.8e 1.0

6. Use the following cross to answer the questions: AaBbcc X AabbCC What is the probability of obtaining offspring that show all three dominant traits? Show your work. a. b. What is the probability that the offspring of this cross will show at least two dominant traits? Show your work. What is the r bab.y of obtaining offspring that shown only one dominant trait? Show your v С.