(a) sexual reproduction gives rise to more viable variations than asexual reproduction. justify This statement and explain how the viable variations affect the evolution of those organisms that repridue sexually. (b//) bDoes genetic combination of mothers play a significant role in determining the sex of a newborn ? give reason also .
Answers
Answer:
reproduction results from the fusion of gametes produced by male and female. Sexual reproduction causes more viable variations because:
There might be an error in the copying of DNA, though the event is rare.
Segregation of chromosome of maternal and paternal origin at the time of gamete formation is random.
There is an exchange of genetic material between homologous chromosomes during formation of gametes.
In case of asexual reproduction, variation is . So, it can be concluded that evolution in sexually reproducing organisms proc
- (a) ..because in sexual reproduction, two individuals are involved whereas in asexual reproduction only single individual is involved.
⸻➤ Explanation:- DNA copying is not absolutely accurate which leads to many variations. Accumulation of favorable variations results in greater diversity and origin of new species.
Therefore sexual reproduction is a basis for evolution.
- (b) No.
- In females sex chromosomes are present as a perfect pair (X X ) chromosomes . In males they are present as a mismatched pair of (X Y ) chromosomes.
- The sex of the child depends on the type of chromosome contributied by the father . The mother can only pas on X chromosome, but if the child receives X chromosome from father also , a girl is born. when child receives Y chromosome from father and X chromosome from mother a boy is born.
●Hope it helps you