Define the terms triploidy and autosomal trisomy and describe characteristics and consequences of each genetic
disorder.What will be an ideal response?
ANSWER: The most common form of polyploidy in humans is triploidy. Triploidy occurs when the
chromosomal number is three times the haploid number. Triploid newborns have multiple
abnormalities, including an enlarged head fused fingers and toes, and malformations of the
mouth, eyes, and genitals. The high rate of embryonic death and failure to survive after birth
indicates that triploidy is a lethal condition. Most autosomal trisomies, a type of aneuploidy
usually caused by nondisjunction, are lethal during prenatal development and account for up
to 50% of the chromosomal abnormalities seen in miscarriages. Only a few autosomal
trisomies result in live births. Down syndrome, trisomy 21, is the only autosomal trisomy that
allows survival into adulthood.
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Heritability is the amount of genetic variation in a particular population and a particular environment
Indicate whether the statement is true or false
The main effect of burning peat, wood, coal, and petroleum on the Earth's climate is:
A. The fires significantly heat the air and cause a rise in global temperature. B. The smoke blocks sunlight from reaching the Earth and causes a significant lowering of the Earth's temperature. C. The fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature. D. The rising heat from fires produces wind that cools the surface of the Earth. E. The fires use up oxygen that would otherwise block penetration of ultraviolet light from reaching the Earth; the increased ultraviolet radiation heats the Earth.
If you observed two female redback spiders, one having 10 offspring and the other 50, what could explain the difference?
A. The female with more offspring ate her mate and was therefore better nourished. B. The female with fewer offspring has a virus. C. The female with more offspring has more estrogen. D. The female with fewer offspring received more sperm from fewer males. E. The female with more offspring is a better hunter.
The lacrimals glands constantly produce__________
Fill in the blank(s) with the appropriate word(s).