Why is it that human males and females who are both heterozygous for the pattern-baldness gene have different phenotypes (males are bald, females are not bald)?
What will be an ideal response?
Pattern baldness is an example of a sex-influenced trait. Males and females do not express the gene in the same way. Pattern baldness is controlled by an autosomal gene that acts as a dominant in males and as a recessive in females. The b/b genotype results in baldness in both sexes, the b+/b+ phenotype results in nonbaldness for both sexes, and the b+/b genotype results in baldness in males but nonbaldness in females.
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Mannitol salt agar (MSA) only allows the growth of halophiles (salt-loving microbes). Among the halophiles, mannitol fermenters release acid that turns the pH indicator yellow; mannitol nonfermenters leave the medium red. Onto MSA you inoculate a halophilic mannitol fermenter, a nonhalophilic mannitol fermenter, and a halophilic mannitol nonfermenter. Thus, the medium is acting as a ________ medium.
A. differential B. selective C. selective and differential D. neither selective nor differential
Which of the following is not an
environmental cue for plants? a. Length of night. b. Temperature. c. Earth’s magnetic field. d. Presence of pathogens. e. Gravity.
What is the basis of Mendel's laws?
A) the behavior of chromosomes during prophase I of meiosis only B) the behavior of chromosomes during mitotic anaphase C) the behavior of chromosomes during prophase I and prophase II of meiosis D) the behavior of chromosomes during metaphase I and anaphase I of meiosis
If protein was the genetic material, where in the Hershey and Chase experiment would you expect to find radioactivity when phage contained 35S-labelled protein?
a. in the bacterial cell b. in the phage progeny c. in the phage spikes d. in the phage coat