Which of the following best describes sperm production in the male human reproductive system?
a- one diploid cell, with 46 chromosomes, undergoes meiosis to form four haploid sperm cells, with 23 chromosomes each.
b- four haploid cells, with 23 chromosomes each, undergo mitosis to form one haploid sperm cell, with 23 chromosomes.
c- one diploid cell, with 46 chromosomes, undergoes mitosis to form four diploid sperm cells, with 46 chromosomes each.
d- four haploid cells, with 23 chromosomes each, undergo meiosis to form one diploid sperm cell, with 46 chromosomes.

Each hereditary trait corresponds to

Cladistics is a way of classifying organisms by examining the characteristics of their ancestors and descendants and depicting the relationships in a cladogram. which of the following best describes a challenge in classifying organisms this way? a. there are millions of species on earth, and a cladogram is not a practical means for classifying all of them. b. it is impossible to tell which organisms are most closely related to each other using a cladogram. c. cladograms are detail-oriented and do not provide a useful understanding of evolutionary relationships. d. there is a limited number of ways to organize the information, so most cladograms end up looking very similar.

Why does controlling transcription affect prokaryotic gene expression?