Question

crossing over occurs when chromosomes overlap and portions of the chromosome swap places. Mistakes during crossing over can lead to?? choose all that apply ! PART A:A. part of the chroma zone is broken off and attached to a nearby chromosome while the other remains in place B. failure of homologous chromosomes or sister chromatids to separate correctly during meiosisC . A portion of chromosome is replicated to have extra portions of genesD. A portion of a chromosome is deletedPart B: nondisjunction can be best described as A. part of one chromosome is broken off and attached to a nearby chromosomeB. failure of homologous chromosomes or sister chromatids to separate correctly during meiosis C . A portion of a chromosome is replicated to have extra portions of genes D. a portion of a chromosome is deleted

Answer 1

Step-by-step explanation:

During crossing over, part of one chromosome is exchanged with another. The result is a hybrid chromosome with a unique pattern of genetic material. One mistake during crossing over would be an unequal crossing over, where this process may create a tandem repeat on one chromosome and a deletion on the other. Tandem repeats occur in DNA when a pattern of one or more nucleotides is repeated and the repetitions are directly adjacent to each other.

On the other hand, when a pair of homologous chromosomes may fail to

separate during meiosis I, or sister chromatids may fail to separate during meiosis II or during mitosis, this phenomenon is called nondisjunction. Now, these problems can result in the production of aneuploid cells. Aneuploidy is a condition in which one or more chromosomes are either lacking or present in excess.

We can conclude that the correct answer is:

Answer:

PART A:

A. Part of one chromosome is broken off and attached to a nearby chromosome while the other remains in place.

D. A portion of a chromosome is deleted.

PART B:

B. failure of homologous chromosomes or sister chromatids to separate correctly during meiosis