how many chromosomes are present in fruit and egg cell has 33chromosomes and pollen grain has 10chromosome
Answers
Answer:
1. The pollen tube contains 12 chromosomes and 3 haploid nuclei, so each nucleus will have 4 chromosomes.
2. Human sex cells do have 23 chromosomes, but not these 23. None, egg cells don't have chromosomes. No, sex cells do have chromosomes. Meiosis reduces chromosome number so that sex cells (eggs and sperm) have a half set of chromosomes–one homolog of each pair.
3. With the exception of sex cells (eggs and sperm), there will be the same number of chromosomes in all cells of the body. If fruit fly skin cells have eight chromosomes then wing cells will also have eight chromosomes. These body (somatic) cells undergo mitosis. Fruit fly somatic cells have eight chromosomes.
Explanation:
Answer:
The number of chromosomes present in the fruit will be 43.
Explanation:
Haploids and Diploids:
Haploids refers to the a single set of chromosomes within the cells of an organism. Sexual reproductions are diploid (having two sets of chromosomes, one from each parent). In humans, only eggs and sperm cells are haploid.
Similarly diploids are the double sets of chromosomes, to obtain a set of haploids from a diploid, we have to half the number of chromosomes from the diploids.
We are given an egg cell and pollen grain in the question, out of which a pollen grain is a haploid and an egg cell is a diploid.
Calculation of chromosomes:
Egg cell is 33(diploid); after meiotic division, it gets half and becomes 16.5(haploid)
On the other hand pollen grain is haploid i.e 10
Now, we know the endosperm cell is formed by the fusion of two polar nuclei and one male gamete; so,
16.5+16.5+10= 43
Therefore, the chromosomes in the fruit will be 43.
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