AP Biology Genetics Test Questions and Answers

AP Bio Test Answers: Genetics.

AP Biology Genetics Test Questions and Answers

1.       A pedigree analysis for a given disorder’s occurrence in a family shows that, although both parents of an affected child are normal, each of the parents has had affected relatives with the same condition.  The disorder is then which of the following?  Recessive. 

2.       What is the difference between a monohybrid cross and a dihybrid  cross?A dihybrid cross involves organisms that are heterozygous for two characters and a monohybrid only one.

3.       What is the reason that linked genes are inherited together? They are located close together on the same chromosome.

4.       When a disease is said to have a multifactorial basis, it means that…? Both genetic and environmental factors contribute to the disease.

5.       Which describes the ability of a single gene to have multiple phenotypic effects?  Pleiotropy.

6.       Morgan and his colleagues worked out a set of symbols to represent fly genotypes. Which of the following are representative?  Vg +vgse +se = vgvgsese.

7.       Pea plants were particularly well suited for use in Mendel’s breeding experiments for all of the following reasons except that…? Peas have an unusually long generation time.

8.       A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers.  This demonstrates…?  Dominance.

9.       One possible result of chromosomal breakage is for a fragment to join a nonhomologous chromosome.  What is this alteration called?  Translocation.

10.   What is the likelihood that the progeny of IV-3 and IV-4 will have wooly hair?  50%.

11.   What is the genotype of individual II-5? ww.

12.   What is the probability that individual III-1 is Ww? 1.

13.   Black fur in mice (B) is dominant to brown fur (b).  Short tails (T) are dominant to long tails (t).  What fraction of the progeny of the cross BbTT x BBtt will have black fur and long tails?  ½.

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