Question

Crossing over occurs when

sister chromatids are pulled apart at the centromere during anaphase II.

homologous chromosomes join together to form tetrads during prophase I.

chromosomes are grouped together into new nuclei during telophase II.



tetrads of homologous chromosomes randomly line up in metaphase I.

Answer 1

and another question

Crossing over occurs when

sister chromatids are pulled apart at the centromere during anaphase II.

homologous chromosomes join together to form tetrads during prophase I.

chromosomes are grouped together into new nuclei during telophase II.



tetrads of homologous chromosomes randomly line up in metaphase I.

Answer 2

my next question

The table below provides the number of chromosomes found in the body cells of various types of organisms.

Diploid Chromosome Number
Fruit Fly 8
Human 46
Goldfish 94

Which of the following is the best explanation for why the chromosome numbers above are all even?

The diploid chromosome number represents two sets of chromosomes, one from each parent, so it is always an even number.

Animal cells always have an even number of chromosomes, and plant cells always have an odd number of chromosomes.

The diploid chromosome number is always even to ensure that equal numbers of chromosomes end up in each daughter cell during meiosis.

The number of chromosomes present in a diploid cell doubles for each generation because there are two parents.