Chapter 15 Flashcards
Why did the improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics?
It allowed the study of meiosis and mitosis, revealing parallels between behaviors of genes and chromosomes
A women is found to have 47 chromosomes including 3 X chromosomes. What would describe her phenotype
Normal female
SRY is best described in which way
A gene region present on the Y chromosome that triggers male development
Calico cats are female because
A male inherits only one of the two X-linked genes controlling their hair color
One possible result of chromosomal breakage is for a fragment to join a nonhomologous chromosome. What is this alteration called
Translocation
Of the following human aneuploidies, which is the one that generally has the most severe impact on the health of the individual?
A. 47, +21
B. 47, XXY
C. 45, X
C
A cell that had 2n +1 chromosomes is
Trisomic
If a human interphase nucleus contains three Barr bodies, it can be assumed that the person
Has four X chromosomes
What is the source of the extra chromosome 21 in an individual with Down syndrome
Nondisjunction or translocation in either parent
A non reciprocal crossover causes what product
Deletion and duplication
