16 Questions
If a child inherits a recessive gene for a trait from each parent, what will be the outcome?
The child will show the trait.
What happens when two brown-haired parents have a blond-haired child?
The child will definitely have blond hair.
In the dominant-recessive genes principle, what is the main characteristic of a recessive gene?
It is masked by the presence of a dominant gene.
Why might someone carry a recessive gene but never show the associated trait?
They have a dominant gene that masks the recessive one.
How do dominant genes affect the expression of traits in the dominant-recessive genes principle?
They mask the effects of recessive genes.
What determines whether a recessive gene will be expressed in an individual?
Whether the individual inherits two recessive genes for that trait.
During which period of prenatal development does organogenesis occur?
Second month
What is the function of the amniotic fluid during prenatal development?
Acts as a shock absorber
At what stage in prenatal development do arm and leg buds start to emerge?
Fourth week
What is the approximate weight of the developing organism at eight weeks of prenatal development?
1/30 ounce
By the end of the fourth month of pregnancy, what structures have formed on the fetus?
Toenails and fingernails
During which prenatal period do the rate of cell differentiation intensify and organs start to appear?
Embryonic period
Which layer of cells provides nutrition and support for the embryo during the germinal period?
Outer layer
Which layer of cells will primarily become the circulatory system, bones, muscles, excretory system, and reproductive system?
Mesoderm
Which life-support systems for the embryo develop rapidly as the embryo's three layers form?
Amnion and umbilical cord
What is the inner layer of cells that later develops into the embryo during the germinal period called?
Blastocyst
Learn about the dominant-recessive genes principle where one gene of a pair always exerts its effects over the other gene. Understand how recessive genes show their influence only when both genes in a pair are recessive.
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