Question

A Self-fertilizing trihybrid plant forms-
A) $8$different gametes and $64$different zygotes.
B) $4$different gametes and $16$ different zygotes.
C) $8$different gametes and $16$ different zygotes.
D) $8$different gametes and $32$ different zygotes.

Answer 1

Trihybrid plant means plant having three pairs of genes. An individual or strain having heterozygous strain is called a trihybrid cross. Crossing between these plants is known as trihybrid crossing.

Complete answer:
Self-fertilization is the phenomenon of union of male and female gametes from the same haploid or diploid or polyploid organism. It is a degree of inbreeding. Self-fertilization widespread from unicellular organisms to very complex organisms. Self -fertilization does not occur in humans as humans are diploid organisms. Self- fertilization occurs mostly in bisexual organisms, including most flowering plants, numerous protozoans and many invertebrates. As we discussed about self-fertilization lets know about the trihybrid forms-
Option A) $8$ different and $64$ different zygotes-
Self-fertilizing trihybrid plants will have $n = 3$ The combination number of gametes are $= {2^n}$. So, the number of combinations are ${2^3} = {\text{ }}8$ combinations. The total number of boxes a Punnett square equals the number of rows times the number of columns. So, a three-trait square has $64$ boxes. So, option A is correct.
Option B) $4$ different gametes and $16$ different zygotes $-$ this combination is not possible as Punnett square has the same number of rows and columns. So, option B is incorrect.
Option C) $8$ different gametes and $16$ different zygotes$-$ this option is also incorrect.
Option D) $8$ different gametes and $32$ different zygotes$-$ this option is not correct.
So, as we know that in a trihybrid cross male and female gamete unite to cross either the male is diploid with female haploid or vice-versa.

So the correct answer is option A.

Additional information:
crossing is a type of swapping of genetic material in the body. As we know that during internal or external fertilization the male and female gametes fuse into each other resulting in the emergence of a new individual known as offspring. The offspring later develops into a zygote in its cell stages. Various defects are also seen like chromosomal defects, gene defects.

Note:
Gametes are the cells which contain one set of dissimilar chromosomes, they are formed through meiosis (reduction division). The most common gametes are sperm and ova. They undergo internal as well as external fertilization and vary in different shape, sizes and function too. Some organisms produce sperm and ova both. Such an organism is called hermaphrodite animals. Example- earthworms.