All of the following circumstances, except can produce new combinations of genetic traits in sperm and eggs that are different from the parents. a). errors during meiosis. b). errors during mitosis. c). crossing over during meiosis. d). mutations due to exposure to chemicals.

Answer;

B). errors during mitosis.

Explanation;

-Mitosis is the process by which somatic cells undergoes division to yield two daughter cells that are identical to the parent cells, in that they have the same number of chromosomes. Errors during mitosis may not contribute to new combinations of genetic traits in sperm and eggs that are different from the parents.

-New combinations of genetic traits in sperms and eggs that are different from the parents results mainly from errors during meiosis, the cross over during meiosis and also the mutations that arise from the exposure to chemicals.

Ans.

New combinations in gametes can produce by errors, during meiosis or by crossing over during meiosis as gamete formation (formation of sperms and eggs) occurs through meiosis. Mutations in germ cells also lead to production of new combinations as mutations are heritable changes.

Mitosis is a type of cell division that takes in normal body cells or somatic cells of eukaryotic organisms. Hence, errors during mitosis cannot produce gametes with new genetic combinations.

Thus, the correct answer is option B). 'errors during mitosis.'

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.