Chapter 11, Problem 12A

Summary Introduction

To replace:

The underlined term with correct vocabulary terminthe given sentence

Introduction:

Genetic disorders result from inheritance of traits which are either dominant or recessive. The basic patterns of human inheritance follow Mendel’s law of inheritance but there are some complex inheritance of traits that do not follow inheritance pattern described by Mendel.

Answer to Problem 12A

Genes found on the sex chromosomes might be associated with sex- linked traits.

Explanation of Solution

Traits that are controlled by genes located on sex chromosomes; X chromosome in particular are called sex- linked traits or X- linked traits. Since males have only X chromosome, they are affected by recessive X- linked traits more often than females. Females usually do not express the recessive trait as other X chromosome will mask the effect of the recessive trait.

Multiple alleles are many alleles for one trait. Inheritance of blood group in humans is determined by multiple alleles. These are not found on sex chromosomes but are present on autosomes.

Hence the correct word in the given sentence is sex- linked traitsand not multiple alleles.