MCQ
- ✓$A -$ Chorionic villi $\rightarrow$ forms placenta
- B$B$ - Yolk sac $\rightarrow$ Prevents desiccation of embryo
- C$C$ - umbilical cord $\rightarrow$ Haemopoiesis
- D$D -$ Blastocyst $\quad \rightarrow$ Forms the embryo
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Reason : No recessive individual are obtained in the monohybrid test cross.