What results if a fragment of a chromosome breaks off and then reattached to the original?

An inversion occurs when a chromosome breaks in two places; the resulting piece of DNA is reversed and re-inserted into the chromosome. Genetic material may or may not be lost as a result of the chromosome breaks.

When part of a chromosome is broken off and reattached upside down the result is called a n?

Inversions: A portion of the chromosome has broken off, turned upside down, and reattached. As a result, the genetic material is inverted.

Which chromosomal abnormality results a chromosome fragment breaking off and reattaching to the original chromosome but in the reverse direction?

chromosomal mutation

An inversion occurs when a chromosome breaks in two places and the region between the break rotates 180° before rejoining with the two end fragments.

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What is it called when a piece of a chromosome is removed and lost?

A translocation occurs when a piece of one chromosome breaks off and attaches to another chromosome. Deletions occur when a portion of the chromosome breaks and genetic material is lost or deleted. A duplication happens when part of a chromosome is copied and additional genetic material is present.

What results if a fragment of a chromosome breaks off?

A translocation occurs when a piece of one chromosome breaks off and attaches to another chromosome. This type of rearrangement is described as balanced if no genetic material is gained or lost in the cell. If there is a gain or loss of genetic material, the translocation is described as unbalanced .

What are chromosome fragments?

An acentric fragment is a segment of a chromosome that lacks a centromere. Because the centromere is the point of attachment for the mitotic apparatus, acentric fragments are not evenly distributed to the daughter cells in cell division (mitosis and meiosis).

Which of the following results in a situation in which the chromosome number is either 2n 1 or 2n 1?

Which of the following results in a situation in which the chromosome number is either 2n+1 or 2n-1 ? An aneuploid individual has either too many or too few chromosomes, usually as a result of nondisjunction.

Which of the following chromosomal abnormalities occurs in females only?

Turner syndrome, a condition that affects only females, results when one of the X chromosomes (sex chromosomes) is missing or partially missing. Turner syndrome can cause a variety of medical and developmental problems, including short height, failure of the ovaries to develop and heart defects.

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What kind of cell results when a diploid and a haploid gametes fuse during fertilization?

What kind of cell results when a diploid and a haploid gamete fuse during fertilization? A triploid cell. A triploid has 3 sets of chromosomes, 2 from diploid and 1 from haploid.

What happens if you are missing a chromosome?

When a sperm fertilizes an egg, the union leads to a baby with 46 chromosomes. But if meiosis doesn’t happen normally, a baby may have an extra chromosome (trisomy), or have a missing chromosome (monosomy). These problems can cause pregnancy loss. Or they can cause health problems in a child.

What is deletions mutation?

Deletion is a type of mutation involving the loss of genetic material. It can be small, involving a single missing DNA base pair, or large, involving a piece of a chromosome.

What are the effects of a deletion mutation?

A deletion changes the DNA sequence by removing at least one nucleotide in a gene. Small deletions remove one or a few nucleotides within a gene, while larger deletions can remove an entire gene or several neighboring genes. The deleted DNA may alter the function of the affected protein or proteins.

What causes chromosome breakage?

Genetic causes

Chromosome gaps, breaks, and interchanges between nonhomologous chromosomes are a result of the defective DNA damage repair. The gene symbol is ATM (includes complementation groups A, C, and D).

What is a Nondisjunction an error in which?

Nondisjunction: Failure of paired chromosomes to separate (to disjoin) during cell division, so that both chromosomes go to one daughter cell and none go to the other. Nondisjunction causes errors in chromosome number, such as trisomy 21 (Down syndrome) and monosomy X (Turner syndrome).

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Why is crossing over so important?

Crossing over is essential for the normal segregation of chromosomes during meiosis. Crossing over also accounts for genetic variation, because due to the swapping of genetic material during crossing over, the chromatids held together by the centromere are no longer identical.