Polyploid cells have a chromosome number that is more than twice the haploid number.
2.
This results in an extra chromosome, making the haploid number 24 rather than 23.
3.
The monoploid number is thus 7 and the haploid number is 3 ?7 = 21.
4.
The chromosomes in this snail are small, and the haploid number of chromosomes is 18.
5.
Wheat has a haploid number of seven chromosomes, still seen in some cultivars as well as the wild progenitors.
6.
In the case of wheat, the origin of its haploid number of 21 chromosomes from three sets of 7 chromosomes can be demonstrated.
7.
In many other organisms, although the number of chromosomes may have originated in this way, this is no longer clear, and the monoploid number is regarded as the same as the haploid number.
8.
During pollen tube growth towards the ovary, the generative nucleus divides to produce two separate sperm nuclei ( haploid number of chromosomes ) a growing pollen tube therefore contains three separate nuclei, two sperm and one tube.
9.
Both kinds of gametes resulting from this segregation ( T1, T2, and N1, N2 ) carry the correct haploid number of genes; and the zygotes formed by union of these gametes with normal gamete will be viable.
10.
Most cat species have a haploid number of 18 or 19 . New World cats ( those in Central and South America ) have a haploid number of 18, possibly due to the combination of two smaller chromosomes into a larger one.
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