Evidence that parthenogenic whiptail lizards are derived from sexually reproducing ancestors includes _____
A) the requirement for male-like behaviors in some females before their partners will ovulate
B) the development and then regression of testes prior to sexual maturation
C) the observation that all of the offspring are haploid
D) the persistence of a vestigial penis among some of the females
A
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What type of bond typically links two different proteins together?
a. a hydrogen bond b. a disulfide bond c. a bond resulting from a dehydration synthesis reaction d. none of the above
What was likely the first informational molecule of life?
A. carbohydrates B. lipids C. proteins D. RNA E. DNA
Two species that occupy identical realized niches will not be able to co-exist for an extended period of time.
Answer the following statement true (T) or false (F)
Answer the following questions in reference to the five items listed below.
A. B. The normal sperm cell of species X carries 11 chromosomes. Following nondisjunction in the formation of secondary spermatocytes and their subsequent fertilization of normal ova, some of the zygotes will have 21 chromosomes, and the remainder will have how many chromosomes? C. How many chromosomes are present in each cell of the germ cell line for a tetraploid species whose diploid complement of chromosomes is 48? D. Following a gene duplication event involving only five loci, how many chromosomes will a human female have? E. How many chromosomes does each somatic cell have in a human male who has two X chromosomes? F. How many chromosomes are present in the somatic cells of a child born with Down syndrome (trisomy 21)?