Why are chromosomal abberations considered to have less significance than gene mutations for subsequent generations?

a) What is the chromosomal abnormality associated with Fragile-X Syndrome?   b) What is the phenotype associated with this disorder?  c) How is this trait inherited?

What is chromosomal mapping?

A condition known as icthyosis hystrix gravior appeared in a boy in the early eighteenth century. His skin became very thick and formed loose spines that were sloughed off at intervals. When he grew up, this “porcupine man” married and had six sons, all of whom had this condition, and several daughters, all of whom were normal. For four generations, this condition was passed from father to son. From this evidence, what can you postulate about the location of the gene?

A) Hoe many cells are produced by the end of meiosis II? B) Are the cells produced at the end of meiosis II haploid or diploid? C) Are the chromosomes of the four final meiotic products replicated or nonreplicated?

What is the difference between a lesion and an ablation?

How Chromosomal Rearrangements are Caused?

Why must the life cycle of sexually reproducing species alternate between haploid and diploid stages? A) Mitosis must occur at some point in the life cycle to prevent a doubling of chromosomes in each generation. B) Meiosis must occur at some point in the life cycle to prevent a doubling of chromosomes in each generation. C) Mitosis must occur at some point in the life cycle to prevent a reduction of chromosomes in each generation. D) Meiosis must occur at some point in the life cycle to prevent a reduction of chromosomes in each generation.

Why is karyotype done at metaphase?

Which sentence does not describe a way in which genetic variation increases during meiosis? A) Random segregation of homologous chromosomes during metaphase/anaphase I. B) Random mutation of the genetic code during DNA replication. C) Random segregation of chromatids during metaphase/anaphase II. D) Crossing-over of homologous chromosomes, to exchange parts of their arms. 2. Choose the correct word to describe the physical, biochemical and behavioural characteristics of an individual, caused by how their genes interact with the environment? A) Morphology B) Genotype C) Physiology D) Phenotype 3. 0000 A) 25 % B) 50% C) 75 % D) 100 % 0000 Two individuals who are heterozygous for gene Y have a child. What is the probability that their child will be heterozygous for the gene? 0000