Cell Biology Questions
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____________________ breeding has been used to develop desirable traits in plants and animals.
Genetic variation gives individuals within a population slight differences that might be an advantage if the _______________ changes.
Sexual reproduction produces ________________ that have a new combination of DNA. This results in genetic _______________ among individuals.
How many daughter cells are produced in mitosis and cell division?
Meiosis forms sex cells with the correct haploid number of _____________. This maintains the correct ___________ number of chromosomes in organisms when sex cells join.
In ___________, one diploid cell divides and makes four haploid cells.
After meiosis I, the two cells formed during this stage go through a second division of the _______________ and cytoplasm called meiosis II. During meiosis II, sister _________________ separate to produce four haploid cells.
Sex cells are _____________; they have only one chromosome from each pair of chromosomes.
During ________________ and cell division, a body cell and its nucleus divide once and produce two identical cells.
During meiosis I, each pair of duplicated homologous chromosomes ___________.
During a process called ___________________, an egg cell and a sperm cell join together. The new cell that forms is called a ______________.
During _______, the reproductive cell grows and duplicates its chromosomes.
Meiosis involves two divisions of the nucleus and the _____________. These divisions, known as meiosis I and meiosis II, result in four haploid cells.
Organisms that reproduce sexually make two kinds of cells - _________ cells and sex cells.
The female sex cell that forms in an ovary.
______________________________ produces and offspring when genetic materials from two different sex cells combine.
Meiosis creates genetic variation by producing _______________ cells.
_______________________________________ are pairs of chromosomes that have genes for the same traits arranged in the same order.
Body cells are ________; they have pairs of chromosomes.
Different organisms have different ______________ of chromosomes.