Explain how sex-limited genes are inherited and give an example of this type of inheritance
What will be an ideal response?
Sex-limited genes are inherited by both males and females but are normally expressed only in one sex. An example is an autosomal dominant trait that controls precocious puberty. This gene is expressed in heterozygous males but not in heterozygous females. Heterozygous females are unaffected but pass this trait on to half of their sons, making it hard to distinguish this trait from a sex-linked gene. Genes that deal with traits such as breast development in females and facial hair in males are other examples of sex-limited genes, as are virtually all other genes that deal with secondary sexual characteristics.
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The two-stage life cycle in plants evolved as an adaptation to life on land.
a. true b. false
A big difference between social learning and imprinting is that
A) imprinting can only take place among members of the same species. B) social learning has a primarily genetic basis. C) social learning is not limited to a sensitive period.
Which of the following is not a compound?
A) table salt (sodium chloride) B) carbon C) water D) methane E) glucose
Which of the following are adaptations for terrestrial life seen in plants?
a. Sporopollenin and an embryo protected and nourished by the parent plant b. Chlorophylls a and b c. Cell walls of cellulose and lignin d. Vascular tissue e. Cuticle and stomata