Genotype of endosperm is ZZA, find out the genotype of male and female plant respectively

Options

A. ZZ,AA
B. ZA,ZA
C. AA,ZZ
D. ZAA,ZZA

Answer

To solve the problem of finding the genotypes of the male and female plants given that the genotype of the endosperm is ZZA, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Endosperm Formation**:
- The endosperm is formed through a process called double fertilization. In this process, one male gamete fuses with the egg cell to form the zygote (which will develop into the embryo), and the other male gamete fuses with the polar nuclei to form the endosperm.

2. **Identifying the Ploidy of Endosperm**:
- The endosperm is triploid (3N). In this case, the genotype of the endosperm is given as ZZA, which indicates that it contains two Z alleles and one A allele.

3. **Determining the Genotype of the Female Plant**:
- The endosperm is formed from the fusion of one male gamete and two polar nuclei from the female gametophyte. Since the endosperm is ZZA, and it has two Z alleles, the female gamete must contribute two Z alleles.
- Therefore, the genotype of the female plant (which is diploid) must be ZZ.

4. **Determining the Genotype of the Male Plant**:
- The male gamete contributes one A allele to the endosperm. Since the male plant is also diploid, its genotype must be AA to provide the single A allele.

5. **Final Genotypes**:
- Thus, the genotype of the female plant is ZZ, and the genotype of the male plant is AA.

### Conclusion:
- The genotypes of the male and female plants are:
- Female Plant: ZZ
- Male Plant: AA