Chapter 10

A heterozygous individual has ________ a. the same allele on both homologous chromosomes b. two different alleles of a gene c. a haploid condition, in genetic terms

An organism's observable traits constitute its __________ a. phenotype b. variation c. genotype d. pedigree

The offspring of the cross \(A A \times a a\) are ___________ a. all \(A A\) b. all \(a a\) c. all \(A a\) d. half are \(A A\) and half are a \(a\)

The probability of a crossover occurring between two genes on the same chromosome _________ a. is unrelated to the distance between them b. decreases with the distance between them c. increases with the distance between them

If one parent is heterozygous for a dominant allele on an autosome and the other parent does not carry the allele, any child of theirs has a ___________ chance of being heterozygous. a. 25 percent b. 50 percent c. 75 percent

True or false? All traits are inherited in a Mendelian pattern.

One gene that gives rise to three traits is an example of ____________ a. polygenic inheritance b. codominance c. pleiotropy

____________ in a trait is indicated by a bell curve. a. An epigenetic effect b. Nondisjunction c. Incomplete dominance d. Continuous variation

Pedigree analysis is necessary when studying human inheritance patterns because ______________ a. humans have approximately 20,000 genes b. of ethical problems with experimenting on humans c. inheritance in humans is more complicated than it is in other organisms d. genetic disorders occur only in humans

Nondisjunction at meiosis can result in _____________ a. base-pair substitutions b. aneuploidy c. crossing over d. pleiotropy

True or false? An individual with three or more complete sets of chromosomes is polyploid.

Klinefelter syndrome (XXY) is most easily diagnosed by __________ a. pedigree analysis b. aneuploidy c. karyotyping d. a Punnett square

Match each example with the best description. dihybrid cross monohybrid cross homozygous heterozygous a. \(b b\) b. \(A a B b \times A a B b\) c. \(A a\) d. \(A a \times A a\)

Match the terms appropriately. polyploid syndrome aneuploidy Mendelian genotype Huntington's disease a. symptoms of a genetic disorder b. extra sets of chromosomes c. caused by a short tandem repeat d. one extra chromosome e. dominant> recessive f. an individual's alleles