When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is:
Correct answer: D. Triploidy
- A. Tetraploidy
- B. Pentaploidy
- C. Diploidy
- D. Triploidy
Explanation
Endosperm is formed due to fusion of the haploid male gamete with the polar nucleus of the embryo sac. But in this case the male plant is tetraploid so that its gametes would be diploid. When these diploid gametes fuse with two polar nuclei of the embryo sac the resultant endosperm would be tetraploid.
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Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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