biology test 3

The gene for flower color in some plants displays incomplete dominance. In one plant species, the genotypes (RR) yield red petals, (rr) yield white petals, and (Rr) yield pink flowers. What is the probability a cross between two plants heterozygous for flower color produce pink-flowering offspring?

Gametes contain half the number of chromosomes that other cells in the body contain. When are gametes produced in organisms?

Which statement describes the structure of DNA?

Hemophilia is a sex-linked genetic disease. If a male with hemophilia and a homozygous normal female have a female child, what is teh probability that the child will be a carrier for hemophilia?

A researcher demonstrates that fish species in a freshwater aquatic environment show genetic variation in each generation. Which property in a fish species explains this variation?

RNA polymerase facilitates transcription of the genetic information in the DNA molecule into mRNA for protein synthesis. What part of the DNA molecule does codes for proteins?

Which cellular organelle contains enzymes that are necessary for intracellular digestion?

DNA is replicated during the cell cycle. Which event is needed to ensure that normal number of chromosomes is present in both daughter cells?

Proteins are produced during translation. Which molecule carries the protein code that is translated?

DNA transcribes the information for protein synthesis in mRNA. Where does transcription take place?

In humans, the allele for having a straight thumb is dominant to the allele for having a curved thumb. A male is homozygous dominant for straight thumbs, and a female has curved thumbs. What is the probability that their offspring has curved thumbs?

Growth rate, length of bones, muscle structure, and hormone levels may all affect human height. Each of these factors is controlled by many different proteins in body cells. What type of gene relationship controls human body height?

Actinomyocin-D was found to be effective in preventing the growth of rapidly dividing tumor cells by blocking DNA replication. Scientist discovered actinomycin-d also causes side effects like hair loss and a decrease in number of red blood cells. Which statement best explains the reason that actinomyocin-D caused the side effects?

Baldness is the loss of human hair on the head and is a recessive sex-linked trait. A male with the recessive genotype and a female heterozygous for the genotype have children. What is the probability that a female child will inherit the baldness trait?

Through cellular respiration, cell convert chemical energy in certain foods to a usable form for cellular functions. Which organelle performs cellular respiration?

Chromosomes in a eukaryotic cell are composed of DNA. What is the main function of DNA?

Why is meiosis important for sexual reproduction?

Which organelle modifies proteins before they are either used by the cell or transported out of the cell?

A plant cell's rate of oxygen release decreases steadily over the course of several hours. A decreasing rate of activity in which organelle could directly explain this change?

In snapdragons, if white flowers are crossed with red flowers, all the offspring have pink flowers. When two pink snapdragons are crossed, some offspring have white, some have red, and some have pink flowers. Which inheritance pattern do snapdragon flowers exhibit?