Question

SOMEONE HELP I HAVE 51 ASSIGMENTS DOU BY WEDNES

How do mutations occur in the genetic code? This represents crossing over during meiosis.

a) During DNA replication, the original DNA strand GTC ACA GGC ATC is copied into complementary strand CAG CCG TAG. This is an example of deletion.

b)Mutations can only occur when passed on thorough reproduction. The majority of mutations are the result of exposure to mutagens.

c)A woman who has sickle cell anemia passes this disease on to her offspring. This means that the mutation for sickle cell anemia MUST occur in the woman’s gametes.

d)Mutations can be silent and not affect the organism that has them.

Answer 1

I think correct answer is not given in the options provided.

Crossing over during meiosis is a process where homologous chromosomes exchange genetic material. It occurs during prophase I of meiosis and can result in genetic recombination, where the offspring receives a combination of genes from both parents.

Mutations can occur in the genetic code due to errors during DNA replication or exposure to mutagens such as radiation or chemicals. Mutations can be of various types, such as point mutations, deletions, insertions, and chromosomal rearrangements. Some mutations can have harmful effects, while others may have no effect or even be beneficial.

Therefore, the option (a) describes a normal process of DNA replication but does not represent crossing over or a mutation. Option (b) is partially correct but does not describe the specific process of mutation that occurs during crossing over. Option (c) is not necessarily true for all cases of sickle cell anemia as it can also occur due to mutations in the mother's somatic cells, not just the gametes. Option (d) is correct but does not provide any information about the specific process of mutation during crossing over in meiosis.