WHAT IS ULTIMATE SOURCE OF ALL DIVERSITY?
A. NATRUAL SELECTION
B. SEXUAL RECOMBINATION
C. MEIOSIS
D. MUTATION
D. MUTATION
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Which maternal serum marker pattern indicates increased risk of Down syndrome in a fetus?
A) Deficient hCG and inhibin A and elevated AFP, estradiol, and pregnancy-associated plasma protein A Progesterone and testosterone B) Elevated hCG, inhibin A, AFP, estradiol, and pregnancy-associated plasma protein C) Deficient hCG, inhibin A, AFP, estradiol, and pregnancy-associated plasma protein D) Elevated hCG and inhibin A and deficient AFP, estradiol, and pregnancy-associated plasma protein A
Answer the following statements true (T) or false (F)
1. Abnormalities in the number of chromosomes, known as nondisjunction, are more common in younger parents. 2. Johann Gregor Mendel posited in his study on inheritance in plants that offspring exhibited an even blending of physical appearance and traits from parents. 3. This statement is false. Mendel posited in his study on inheritance in plants that offspring exhibited traits that are transmitted faithfully from parents to offspring in specific patterns. 4. This statement is false. The process of meiosis was not understood by the scientific community during Mendel’s lifetime. Mendel came to understand his laws of segregation and independent assortment through his meticulous breeding of pea plants with distinct observable traits. 5. An organism can have the genotype for an inherited genetic disease or condition, but never develop that condition.
____ is the best studied species of bacteria
a. Rhizobium sp. b. Prevotella copri c. E. coli d. G. lamblia e. Agrobacterium sp.
A negative feedback system has four steps. Please choose the answer that lists the steps in the correct order
a. sensory receptors, stimulus, brain, effectors b. stimulus, sensory receptors, brain, effectors c. effectors, brain, sensory receptors, stimulus d. brain, effectors, sensory receptors, stimulus e. stimulus, effectors, sensory effectors, brain