How many chromosomes are present in each cell of pollen grain of Pyrus Malus?

If the diploid chromosome number of a flowering plant is 24, then the somatic cells of the plant each contain 24 chromosomes (12 maternal and 12 paternal). Each of the three haploid nuclei in the germinated pollen grain must contain 12 chromosomes, and each of the 8 nuclei within the embryo sac contain 12 chromosmes.

How many chromosomes does a lettuce cell contain?

Each human somatic (or body) cell contains two complete sets of chromosomes (one from each parent). This is the normal for Eukaryotes and is known as diploid (2n). For humans (only) this means our cells have 46 chromosomes. For other species, this number can be very different – e.g. Lettuce 14, Goldfish 94.

How many chromosomes are in a normal watermelon somatic cell?

The standard number of chromosomes in watermelon is 22. This is called the diploid number (di meaning two, as in dissect – cut in two). With this even number, cell division is highly regular and produces pollen and egg cells with 11 chromosomes that recombine to produce seed with the usual 22 chromosomes.

Is a sperm a haploid or diploid?

Gametes are an organism’s reproductive cells. They are also referred to as sex cells. Female gametes are called ova or egg cells, and male gametes are called sperm. Gametes are haploid cells, and each cell carries only one copy of each chromosome.

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How many nuclei are present in the pollen grain?

pollen grain A microspore in flowering plants, which germinates to form the male gametophyte, a structure made up of the pollen grain plus a pollen tube. The grain contains 3 haploid nuclei (a tube nucleus and 2 sperm nuclei), which pass down the tube to the ovum.

What are the 4 types of chromosomes?

On the basis of the location of the centromere, chromosomes are classified into four types: metacentric, submetacentric, acrocentric, and telocentric.

Is DNA present in lettuce?

We know chimps and bonobos share 99% of our genes. More startling is an even newer discovery: we share 99% of our DNA with lettuce.

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