Q: How is eye color in humans determined? Read this paragraph and choose the correct option from the provided answers: Eye color in humans is determined by multiple genes. Use the Eye Color Calculator (http://openstaxcollege. org/l/ eye_color_calc) to predict the eye color of children from parental eye color. In some cases, several genes can contribute to aspects of a common phenotype without their gene products ever directly interacting. In the case of organ development, for instance, genes may be expressed sequentially, with each gene adding to the complexity and specificity of the organ. Genes may function in complementary or synergistic fashions, such that two or more genes need to be expressed simultaneously to affect a phenotype. Genes may also oppose each other, with one gene modifying the expression of another. In epistasis, the interaction between genes is antagonistic, such that one gene masks or interferes with the expression of another. "Epistasis" is a word composed of Greek roots that mean "standing upon. " The alleles that are being masked or silenced are said to be hypostatic to the epistatic alleles that are doing the masking. Often the biochemical basis of epistasis is a gene pathway in which the expression of one gene is dependent on the function of a gene that precedes or follows it in the pathway. An example of epistasis is pigmentation in mice. The wild-type coat color, agouti (AA), is dominant to solid-colored fur (aa). However, a separate gene (C) is necessary for pigment production. A mouse with a recessive c allele at this locus is unable to produce pigment and is albino regardless of the allele present at locus A (Figure 12.20). Therefore, the genotypes AAcc, Aacc, and aacc all produce the same albino phenotype. A cross between heterozygotes for both genes (AaCc x AaCc) would generate offspring with a phenotypic ratio of 9 agouti:3 solid color:4 albino (Figure 12.20). In this case, the C gene is epistatic to the A gene. Choices: - random chance - by the father - temperature of the womb - multiple genes A:
multiple genes

Q: Chitin is a substance that is found in what part of animals like beetles and lobsters? Read this paragraph and choose the correct option from the provided answers: The cell walls in many species of fungi contain chitin. Chitin is tough carbohydrate found in the shells of animals such as beetles and lobsters. The cell wall of a plant is made of cellulose, not chitin. Choices: - brains - tails - eggs - shell A:
shell

Q: Q: What is produced during the light reactions in photosynthesis? Read this paragraph and choose the correct option from the provided answers: Photosynthesis begins with the light reactions. It is during these reactions that the energy from sunlight is absorbed by the pigment chlorophyll in the thylakoid membranes of the chloroplast. The energy is then temporarily transferred to two molecules, ATP and NADPH, which are used in the second stage of photosynthesis. ATP and NADPH are generated by two electron transport chains . During the light reactions, water is used and oxygen is produced. These reactions can only occur during daylight as the process needs sunlight to begin. Choices: - carbon - waste - nitrogen - oxygen A:
A: oxygen

Question: Q: Strong, stable bonds between carbon atoms produce complex molecules containing chains, branches, and rings; the chemistry of these compounds is called what? Read this paragraph and choose the correct option from the provided answers: Summary 20.1 Hydrocarbons Strong, stable bonds between carbon atoms produce complex molecules containing chains, branches, and rings. The chemistry of these compounds is called organic chemistry. Hydrocarbons are organic compounds composed of only carbon and hydrogen. The alkanes are saturated hydrocarbonsthat is, hydrocarbons that contain only single bonds. Alkenes contain one or more carbon-carbon double bonds. Alkynes contain one or more carbon-carbon triple bonds. Aromatic hydrocarbons contain ring structures with delocalized electron systems. Choices: - animal chemistry - inorganic chemistry - nuclear chemistry - organic chemistry A:
Answer: organic chemistry

*Question*
Q: Overharvesting is especially challenging for species with what type of habitat? Read this paragraph and choose the correct option from the provided answers: Choices: - tundra - allowed - classified - restricted A:
**Answer**
restricted

(Q).
Q: The first line of defense includes mechanical, chemical, and which other barrier? Read this paragraph and choose the correct option from the provided answers: The first line of defense includes mechanical, chemical, and biological barriers. Choices: - independent - physical - surgical - biological A:
(A).
biological