Different alleles that are both expressed in a heterozygote are
A) dominant.
B) codominant.
C) incompletely dominant.
D) homozygous dominant.
B) codominant.
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Which statement best describes passive transport?
A. A substance goes from an area of high concentration to an area of low concentration, and this requires energy. B. A substance goes from an area of high concentration to an area of low concentration, and this releases energy. C. A substance goes from an area of low concentration to an area of high concentration, and this requires energy. D. A substance goes from an area of low concentration to an area of high concentration, and this releases energy.
Florists often create brightly colored flowers by immersing the stems in colored water. Which
cells are primarily responsible for this color change?
a. phloem b. xylem c. xylem and phloem d. neither xylem nor phloem
Which of the following occurs as a result of meiosis?
A) Haploid nuclei with unpaired chromosomes are produced from diploid parent nuclei with paired chromosomes. B) Diploid nuclei with paired chromosomes are produced from haploid parent nuclei with unpaired chromosomes. C) Haploid nuclei with paired chromosomes are produced from diploid parent nuclei with unpaired chromosomes. D) Diploid nuclei with unpaired chromosomes are produced from haploid parent nuclei with paired chromosomes.
Which of the following is an example of epigenetic inheritance?
A. inheritance of a beneficial allele in offspring B. development of skin cancer in a parent and child due to extensive sun exposure and subsequent UV DNA damage C. requirement of some plant species to experience cold temperatures before they are able to initiate flowering D. a paternal response to low nutrition resulting in a modification of DNA in developing sperm E. inheritance of an environmental sensitivity to oxygen levels in the expression of specific genes in a species of fish