The following statements are true or false. If true, mark TRUE. If false, mark F
ID: 62630 • Letter: T
Question
The following statements are true or false. If true, mark TRUE. If false, mark FALSE and change the statement to make it true.
a. A human male who exhibits Barr bodies in his somatic cells probably has multiple Y chromosomes.
b . Mammalian females that have supernumerary (multiple) X chromosomes (XXX or XXXX) are expected to exhibit only one Barr body per nucleus because the process of X-chromosome inactivation silences (inactivates) one X per nucleus regardless of how many X chromosomes are present in the cell.
c. Aneuploidy will result from nondisjunction during meiosis but not during mitosis.
d. The severity of fertility impairment in an inversion heterozygote is expected to increase with the length of the inverted chromosomal region only if the inversion includes the centromere.
e. In mammals and most other vertebrates, deletions involving moderate to large portions of chromosomes are usually very deleterious or frankly lethal, but small deletions are sometimes tolerated.
e. Aneuploid conceptions rare in humans, and only a few of the 23 chromosome pairs have been found to exhibit aneuploidy in tissues collected from spontaneously aborted fetuses or live births.
f. Differences in the duration of the gametogenic process might explain why aneuploidy increases dramatically with age of the mother, but much less so with age of the father.
Explanation / Answer
Answer-
a.false---male never express these "Barr bodies"
b.two X-chromosomes
c.false
d.false
e.true
f.false