Chapter 9

A heterozygote has a _____ for a trait being studied. a. pair of identical alleles b. pair of nonidentical alleles c. haploid condition, in genetic terms

The observable traits of an organism constitute its _____ a. phenotype b. sociobiology c. genotype d. pedigree

The offspring of the cross \(A A \times a a\) are _____ a. all \(A A\) b. all aa c. all \(A a\) d. \(1 / 2 A A\) and \(1 / 2\) aa

Assuming alleles have a clear dominance relationship, a dihybrid cross leads to a phenotypic ratio in offspring that is close to _____ a. 1: 2: 1 b. 3: 1 c. 1: 1: 1: 1 d. 9: 3: 3: 1

The probability of a crossover occurring between two genes on the same chromosome is _____ a. unrelated to the distance between them b. increased if they are close together c. increased if they are far apart

If one parent is heterozygous for a dominant autosomal allele and the other parent does not carry the allele, a child of theirs has a _____ chance of being heterozygous. a. 25 percent b. 50 percent c. 75 percent d. no chance; it will die

A bell curve indicates _____ in a trait. a. pleiotropy b. crossing over c. continuous variation d. aneuploidy

Nondisjunction at meiosis can result in _____ a. pleiotropy b. crossing over c. continuous variation d. aneuploidy

Color blindness is a case of _____ inheritance. a. autosomal dominant b. autosomal recessive c. X-linked dominant d. X-linked recessive

Klinefelter syndrome \((X X Y)\) is easily diagnosed by _____ a. pedigree analysis b aneuploidy c. karyotyping d. phenotypic treatment

Is this statement true or false? A son can inherit an X-linked recessive allele from his father.

Is this statement true or false? Body cells may inherit three or more of each type of chromosome characteristic of the species, a condition called polvploidy

A recognized set of symptoms that characterize a specific disorder is a _____ a. syndrome b. disease c. pedigree

Watch each example with the most suitable description. _____ dihybrid cross _____ monohybrid cross _____ homozygous condition _____ heterozygous condition 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. _____ polyploidy _____ syndrome _____ aneuploidy _____ nondisjunction during meiosis _____ epistasis a. symptoms that characterize a genetic disorder b. extra sets of chromosomes c. gametes with the wrong chromosome number d. one gene affects another