Mendel's dihybrid crosses, but not his monohybrid crosses, show that
A. some genes are linked together.
B. the two alleles controlling a trait are divided equally among the gametes.
C. alleles for different traits are inherited independently.
D. one of the pair of alleles is dominant to the other.
E. the crossing of two different homozygous forms will not produce any offspring in the first generation that will look like either of the parents.
Answer: C
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Refer to the accompanying figure. In every case, caterpillars that feed on oak flowers look like oak flowers. In every case, caterpillars that were raised on oak leaves looked like twigs. These results support which of the following hypotheses?
A) The longer day lengths of summer trigger the development of twig-like caterpillars. B) Differences in air pressure, due to elevation, trigger the development of different types of caterpillars. C) Differences in diet trigger the development of different types of caterpillars. D) The differences are genetic. A female will either produce all flowerlike caterpillars or all twig-like caterpillars. A) The longer day lengths of summer trigger the development of twig-like caterpillars. B) Differences in air pressure, due to elevation, trigger the development of different types of caterpillars. C) Differences in diet trigger the development of different types of caterpillars. D) The differences are genetic. A female will either produce all flowerlike caterpillars or all twig-like caterpillars.
Which of the following is considered a simple tissue?
a. parenchyma b. phloem c. epidermis d. xylem
The correct sequence for the phases of the cell cycle, starting with a newly divided cell, is
A. replication - binary fission - cytokinesis. B. cytokinesis - replication - interphase - mitosis. C. interphase - mitosis - cytokinesis. D. interphase - binary fission - cytokinesis. E. cytokinesis - mitosis - interphase.
Consider an infertile couple, of which both partners are able to produce healthy gametes, but the woman’s history of
endometriosis has rendered her unable to carry a fetus. Suppose this couple undergoes IVF with their own gametes, followed by embryo transfer to the uterus of a gestational surrogate, and the birth of a baby. What is the genetic relationship between the surrogate and the baby? a. The baby shares only X chromosomal DNA with the gestational surrogate. b. The baby shares 25% of its genes with the gestational surrogate. c. The baby shares half of its genes with the gestational surrogate. d. The baby is genetically identical to the gestational surrogate. e. There is no genetic relationship between the gestational surrogate and the baby.