Assume that plants with red flowers crossed with plants with white flowers give rise to plants with pink flowers. You can eliminate the plants with red flowers by crossing ________-flowered plants for the first generation, and _________-flowered plants for the second.
Fill in the blank(s) with the appropriate word(s).
pink; white
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Which of the following events occurs during meiosis? a. All of the choices
b. Corresponding segments are exchanged between nonsister chromatids. c. Nonsister chromatids break at the same point along their length. d. The duplicated homologous chromosomes become attached and precisely aligned.
Cartilaginous fishes retain __________ in their body, so they do not lose or gain water by osmosis. Fill in the blank(s) with the appropriate word(s)
Pioneer plant species are usually characterized by
a. small size. b. high dispersal rates c. slow maturation. d. high dispersal rates and high numbers of offspring e. small size, efficient dispersal mechanisms, and slow maturation.
The sperm structure that helps penetrate the egg cell is the ________
A) midpiece B) tail C) ATP D) acrosome