How many gene pairs are involved in generating a typical 1:4:6:4:1 ratio?
What will be an ideal response?
two
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The autonomic nervous system
A) integrates sensory inputs to the brain. B) carries signals to and from skeletal muscles. C) regulates the internal environment of the body. D) is part of the central nervous system.
Syphilis can be transmitted
A) by sexual contact. B) from mother to fetus. C) by fomites. D) both by sexual contact and from mother to fetus. E) by sexual contact, by fomites, and from mother to fetus.
What is the best description of double fertilization in angiosperms?
A. One pollen grain fertilizes the embryo sac; the other sperm fertilizes the pollen grain. B. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the polar nuclei, which forms the seed coat. C. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the polar nuclei, which forms the endosperm. D. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the ovary, which becomes the fruit. E. One sperm fertilizes the egg, which develops into the embryo; the other sperm produces the pollen tube.
Apply the concept of sex linkage to explain why color blindness is more prevalent in men than in women.
B) Mary is concerned that she may be a carrier for hemophilia, a sex-linked condition located on the X chromosome. Mary is married to John, who doesn’t have hemophilia. Assuming Mary is a carrier, what are the genotype ratios expected for Mary and John’s kids (specify for boys and for girls)? C) Mary and John have 2 boys, none of them has hemophilia. Can we use this fact as proof that Mary does not carry the allele for hemophilia? Explain your argument.