Question

Write the ratio of chromosomes in egg cell, zygote and endosperm in angiospermic plant.

Answer 1

1:2:3 here it is check this

Answer 2

Answer:

The ratio of chromosomes in the egg cell, zygote, and the endosperm in angiosperms would be 1:2:3.

Explanation:

• Chromosome number becomes half in the case of an egg cell.

• As the egg cell is the female gamete and gametes always possess half the no. of chromosomes, thus are haploid.

So egg cell = n

• A zygote or the fertilized egg or fertilized ovum is the fusion product, which is the outcome of the union of a haploid male and a female gamete.

• This fusion of two gametes carrying half the number of chromosomes makes the ploidy of the zygote double.

So zygote = 2n (diploid)

• The endosperm is the nourishing tissue that surrounds the embryo in the seeds of most angiosperms. It is formed from the fusion of one male gamete(n) with a diploid central cell nucleus (2n).

• Endosperm in angiosperms possesses 3 sets of chromosomes. Thus it is triploid.

So endosperm= 3n

Hence the ratio of chromosomes in the egg cell, zygote, and endosperm can be represented as -

Egg:zygote:endosperm = 1:2:3