A wild species with 2n=22 chromosomes is cultivated and it chromosome number is

Question

A wild species with 2n=22 chromosomes is cultivated and it chromosome number is changed in the process to 3n=33 chromosomes. This is an example of a)monosomy b) trisomy c) aneuploidy d) euploidy e) none of the above The following illustrates a way in which ___ arises, a) an inversion b) an aversion c) deletion d) reciprocal translocation e) duplication Criss-cross pattern of inheritance suggests that the gene of interest is: a) autosomal dominant b) autosomal recessive c) X-linked dominant d) X-linked recessive e) none of the above Presence of only one copy of the X chromosome in males (XY) of some species produces a condition called ___. a) haploidy b) monosomy c) hemizygosity d) haploinsufficiency e) none of the above, it is lethal A gene ___ a) is a specific segment of DNA b) is a basic unit of biological information c) serves as a functional unit by encoding a particular RNA or protein d) a and c only e) a, b and c A mutation is ___ a) a heritable alteration in DNA sequence b) source of new alleles c) a non-heritable change in the DNA structure d) a and b are true A Drosophila recessive mutant allele called ruby (rb) causes ruby eye phenotype. In order to determine its localization a cross was set up between true breeding ruby female and wild type (red-eyed) male. If the mutation is X-linked, the expected F_2 offspring will show the following phenotypic ratio: a) 1 ruby female: 1 wild type female: 1 ruby male: 1 wild type male b) 3 ruby females: 1 wild type male c) 1 ruby female: 1 wild type male d) all females and males wild type e) 1 wild type female: 1 ruby male When working with Drosophila crosses, the P_1 should be transferred to a new vial before the F_1 emerge. a) true b) false

Explanation / Answer

1. Trisomy; Trisomies is the presence of 1 extra chromosome (2n+ 1).

2. Reciprocal translocation; In a reciprocal translocation two broken off chromosome pieces of non-homologous chromosomes are exchanged. This is a relatively frequent anomaly.

3. X-linked recessive; This type of inheritance of recessive sex linked character from father to daughter and then from the daughter to her sons is known as criss-cross inheritance or X-linked inheritance.

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