In a dihybrid cross of individuals who are AaBb, what proportion of the F2 offspring are expected to have the genotype AABB?
A) 9/16
B) 1/16
C) 1/2
D) 3/16
E) 6/16
A) 9/16
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Which of the following statements is
CORRECT?
a. A population cannot exceed the carrying capacity even temporarily. b. An organism can occupy more than one trophic level, depending upon the feeding habits of the organism. c. Once populations of organisms become isolated, they remain so by various types of isolation mechanisms. d. The limits of a population are all traced to climatic or physical factors. e. Organisms with different evolutionary backgrounds can occupy the same niche at the same time.
Which is the main antibody in secretions of exocrine glands?
a. IgA b. IgD c. IgE d. IgG e. IgM
Why are mitochondria present in the sperm?
a. to provide energy for the movement of the flagellum b. to provide energy for the acrosome to penetrate the egg c. to provide nutrients for the sperm d. to provide nutrients for the developing embryo e. to provide energy for the maturation of the sperm
What are the two main functions of the choroid layer, located behind the retina in humans?
What will be an ideal response?