| A | B |
|---|
| germ cells | immature reproductive cells that develop in male and female animals |
| gametes | sex cells |
| asexual reproduction | one parent alone produces offspring and each offspring inherits the same number and kinds of genes as its parents |
| genes | particular stretched of chromosomes |
| sexual reproduction | involved two parents production of gametes with meiotic cell divisions (variation) |
| allele | each unique molecular form of the same gene |
| meiosis | divides chromosomes into seperate parcels not once but twice prior to cell division |
| chromosome number | total sum of chromosomes in cells of a given type |
| diploid number | it has a pair of each type of chromosome |
| homologous chromosomes | they line up next to each other during meiosis and they look alike |
| haploid number | one of each kind (n) |
| sister chromatids | when they become attached they form a chromosome |
| crossing over | a molecular interaction between two of the nonsister chromatids of a pair of homologous chromosomes |
| spores | haploid resting cells |
| sperm | a common type of mature male gametes |
| oocyte | immature egg |
| egg | (ovum) a mature femal gamete |
| fertilization | the time when a male gamete unites with a female gamete and their hapoid nuclei fuse |
