A species of grasshopper normally has 8 chromosomes, 4 of which are acrocentric and 4 of which are metacentric. An unusual grasshopper is discovered and is found to have 7 chromosomes, 5 of which are metacentric and 2 of which are acrocentric. Which of the following is NOT likely to be true of the unusual grasshopper?
| a. |
it arose as a result of a Robertsonian translocation |
|
| b. |
one of its metacentric chromosome is a translocation chromosome |
|
| c. |
one of its acrocentric chromosomes is a translocation chromosome |
|
| d. |
it is missing some of the genetic information that is present in the normal grasshoppers |
|
| e. |
none of the above - they are all likely to be true |
The correct option is option e.
none of the above - they are all likely to be true
A species of grasshopper normally has 8 chromosomes, 4 of which are acrocentric and 4 of...
3) The diploid cells of A. roksiki have a total of 4 chromosomes (2n=4). One of the homologous pairs is large with an acrocentric centromere and the other is small with a metacentric centromere. A. Draw the chromosomes from A. roksiki as they would appear in metaphase 2 of meiosis. Include all cells and all chromosomes. Assume meiosis is proceeding normally and ignore any effects of crossing over. (6 pts) B. A strain of A. roksiki is heterozygous for a...
Drosophila melanogaster, the fruit fly, has a 2n chromosome number of 8 (4 chromosomes – 3 autosomes and 1 sex chromosome). Assume that you are microscopically examining the mitotic and meiotic cells of this organism. You note that in the female, two chromosomal pairs are metacentric and two pairs are acrocentric. Draw the chromosomal configurations as you would expect to see them at the stages listed: i. mitotic metaphase ii. primary oocyte (meiotic metaphase I) iii. secondary oocyte (meiotic metaphase...
A male Drosophila from a wild-type stock is discovered to have only seven chromosomes, whereas normally 2n = 8. Close examination reveals that one member of chromosome IV (the smallest chromosome) is attached to (translocated to) the distal end of chromosome II and is missing its centromere, thus accounting for the reduction in chromosome number. If this male mates with a female with a normal chromosome composition who is homozygous for the recessive chromosome IV mutation eyeless (ey), what chromosome...
5. (16 pts.) A cell has two pairs of submetacentric chromosomes, which we wili cail chromosomes I,, Ib, Ila, and Ilb. Submetacentric chromosomes have their centro nere abou midway between the telomere and middle of the chromosome as shown. Chromosomes Ia and I, are homologues and chromosomes II, and Ilb are homologues. Allele R is located on the p arm (short arm) of chromosome of chromosome la, and allele r is located at the same position on chromosome lb. Allele...
in a reciprocal translocation heterozygote, which of the following are true? You can choose multiple options. Select one or more: a. The individual with a reciprocal translocation will not produce fertile gametes. b. In a reciprocal translocation heterozygote about 1/3 of their gametes are likely to be non-viable. c. A reciprocal translocation does not cause phenotypic effects. d. In a reciprocal translocation heterozygote about 1/2 of their gametes are likely to be non-viable. e In a reciprocal translocation heterozygote some...
In a reciprocal translocation heterozygote, which of the following are true? You can choose multiple options. Select one or more: a. The individual with a reciprocal translocation will not produce fertile gametes. b. In a reciprocal translocation heterozygote some genes are missing and some genes are duplicated. c. A reciprocal translocation does not cause phenotypic effects. d. In a reciprocal translocation heterozygote there is the same amount of genetic information (same number of gene copies) as in a diploid individual...
can help me writing a summary please Chromosomal Aberrations and Human Disorders In addition to mutations that alter the information content of a single gene, chromosomes may be subjected to more extensive alterations that occur most commonly during cell division. Pieces of a chromosome may be lost or segments may be exchanged between different chromosomes. Because these chromosomal aberrations follow chromosomal breakage, their incidence is increased by exposure to agents that damage DNA, such as viral infection, X‐rays, or reactive...
13,15 & 16
13. Deletion, Translocation, Inversion, Duplication, OR Mosaicism? Involved in 46, 5p- May result in a position effect which affects gene expression May result in pseudodominance of allele normally recessive to a dominant allele Two genetically distinct populations of cells in a single individual Will result in abnormal gamete formation (more than one answer) Involved in familial Down syndrome Lethal if it occurs in the same region of two homologous chromosomes No loss or gain of genetic material...
I need answers for 13 to 15. Thank you
13. Deletion, Translocation, Inversion, Duplication, OR Mosaicism? Involved in 46, 5p- May result in a position effect which affects gene expression May result in pseudodominance of allele normally recessive to a dominant allele Two genetically distinct populations of cells in a single individual Will result in abnormal gamete formation (more than one answer) Involved in familial Down syndrome Lethal if it occurs in the same region of two homologous chromosomes No...
mays is a diploid species with 10 pairs of chromosomes in each somatic cell. How many chromosomes will be found per cell in each of the following chromosome mutants? Questions 64 to 67 are connected 64) Trisomy? E) 21 D) 30 A) 19 B) 22 65) Monosomy E) 21 A) 19 B) 22 C) 60 66) triploid E) 21 B) 22 67) Tetrasomy D) 30 E) 21 A) 19 B) 22 68) Species I has 2n -12 chromosomes and species...