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In a certain plant, when individuals with blue flowers are crossed with individuals with blue flowers, only blue flowers are produced. Plants with red flowers crossed with plants with red flowers sometimes produce only red flowers, although other times they produce either red or blue flowers. When plants with red flowers are crossed with plants with blue flowers, sometimes only red flowers are produced; other times either red or blue flowers are produced. Which of the following is true?

Which of the following is typical of cancer cells?

Crossing over is facilitated by a ____ orientation between homologous chromosomes.

The role of environmental factors on gene expression is illustrated by ____.

The ability of rats to cope with stress as adults can be affected by ____.

In sweet peas, dominant alleles C and P are necessary for colored flowers. In the absence of either (__ pp or cc __) or both (cc pp), the flowers are white. What the phenotypic ratios be for the cross of Cc pp x cc Pp?

Which action is unable to produce variation?

Which of the following occur in telophase I of meiosis?

In sexual reproducers, meiosis gives rise to _____________.

Genetic diversity arises as a consequence of ________, which produce(s) different alleles of a gene.