Do you think there is an upper limit to chromosome number? Explain.

There is a upper limit to chromosome number. The upper limit is caused by incomplete segregation of sister chromatids and trimming of the long arms.

Explanation:

There is a practical limit to the number of chromosomes related to how they can line up in homologous pairs for meiosis in sexually reproducing organisms.

They have a practical limit to number of spindle fibers that you can have in the cell during mitosis.

There is a fern with more than thousand chromosomes. The micronuclei represent loss of DNA from the genome and are lost outright through further cell divisions.

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.