Exam 23: Patterns of Gene Inheritance

The four o'clock flower is an example of incomplete dominance: R = red,r = white,and Rr = pink.If two hybrids are crossed,what are the chances that an offspring will have pink flowers?

Humans can have any of several eye colors,This is because we possess a variety of

A cross that involves two traits is called a ______ cross.

Which is NOT true according to Mendel's law of segregation?

Two parents with widow's peak and short fingers have a child with a continuous hairline and long fingers.What are the genotypes of the two parents? (W = widow's peak; S = short fingers)

Which of the following crosses will yield four phenotypes in a ratio of 9:3:3:1?

The skin pigment melanin is expressed differently according to exposure to sunlight,with a greater production of the molecule with greater exposure.However,the degree of production can never exceed the inherited genetic level.What evolutionary advantage would be gained from having this phenotypic range for skin pigmentation?

Both parents are heterozygous for Tay-Sachs disease (an autosomal recessive disorder).Three children in a row were born with Tay-Sachs disease.What is the chance that a fourth child will have Tay-Sachs disease?

Mendel's law of segregation implies that the two members of an allele pair

If you were to breed a black male guinea pig to a brown female guinea pig in an attempt to determine which one was homozygous dominant and which one was homozygous recessive,how could you be certain that the guinea pigs are truly homozygous?

How many alleles are required to express a monohybrid trait?

Which of the following crosses will yield four phenotypes in the 1:1:1:1 ratio?

If you had a black male guinea pig and brown female guinea pig,but you didn't know which was the dominant characteristic,how would you find out the dominant color,assuming the dominant characteristic is homozygous,?

Which allele combination represents a recessive monohybrid trait?

Which of the following is an autosomal dominant disorder?

Traits that are controlled by several sets or pairs of alleles,such as skin color and height in humans,are the result of what form of inheritance?

In guinea pigs,B = black,b = brown,S = short hair,s = long hair.Two heterozygous individuals reproduce.The expected results are