Exam 5: The Inheritance of Complex Traits

Skin color in humans is a(n)____________________ trait.

Animal models such as the ____________________ and ____________________ are being studied to identify single genes that control aspects of learning,memory,and spatial perception.

Summarize the results of performing genome-wide searches for genes that control obesity.

If two genes control a trait and each has a dominant and a recessive allele,there are ____ phenotypic classes in the F2 generation.

Using today's genetic technology,it is possible to select ____________________ for specific traits.

One of the important assumptions made during the study of heritability in twins is that monozygotic twins share all their ____________________ and their ____________________.

The correlation coefficient for unrelated people is ____________________.

The heritability of a trait is the ____.

Define and give examples of discontinuous and continuous phenotypic variation and explain how understanding of these two concepts resulted in important advances in human genetics.

Most evidence indicates that skin color is controlled by ____ gene pair(s).

The concept of ____ explains why children of parents who are at the extreme ends of a normal (bell-curve)distribution for a phenotype are usually closer to the population average for the phenotype.

According to Wilhelm Stern's method of measurement,a ten-year-old child who is able to perform the mental tasks of a ten-year-old (but not of an eleven-year old)has an IQ of ____.

The additive model for polygenic inheritance proposes that the genes controlling a trait are all on one chromosome.

Figure -Refer to the figure above to explain the threshold model of complex traits.

Along with a significant genetic component,____________________ plays a significant role in the development of spina bifida.

The genotype is fixed at the moment of ____________________ and,barring mutation,is unchanging.

Mutations of some genes for human height result in ____________________.

Continuous phenotypic variations can be explained by Mendelian inheritance.

For a complex trait that is observed less frequently in a given sex in a given family,the recurrence risk for this trait is ____________________ for future children of that sex.

Single nucleotide polymorphisms (SNPs)are organized into blocks called ____ and are inherited together.