Question

c. disorders caused by dominant alleles

1. less ______ than recessive disorders

1. huntingtons disease- damages nervous system and usually appears during adulthood.

a. 75% chance if both parents ______
b. since disease strikes later in life, person can have children before disease appears. allele is passed on even though disease is ______
e. males and females can differ in ______-linked traits

1. mendel figured out much about heredity, but did not know about ______

a. mendel only studied ______ traits
b. expression of genes on sex chromosomes ______ from autosomal genes

1. sex - linked genes

a. genes located on sex - chromosomes called ____ - ____ genes

Explanation:

This is a biology (Natural Science subfield) question about genetic disorders and inheritance. Let's fill in the blanks:

1. For "Less ____ than recessive disorders" in dominant allele disorders: Dominant disorders are less common because if a dominant allele causes a disorder, having one copy (heterozygous) shows the disorder, so affected individuals are less likely to reproduce (since they show symptoms), making them less common than recessive disorders (where carriers can be asymptomatic). So "common".

2a. "75% chance if both parents ____" for Huntington's Disease: Huntington's is autosomal dominant. If both parents are heterozygous (Hh x Hh), the Punnett square gives 75% chance of having the disease (HH, Hh, Hh). So "are heterozygous (or have the disease allele)".

2b. "Allele is passed on even though disease is ____": Since Huntington's appears later in life, the allele is passed on before symptoms appear, so the disease is "undetected" or "not yet apparent".

E. "Males and Females can differ in ____-linked traits": Sex - linked traits (X - linked or Y - linked). So "sex".

1. "Mendel figured out much about heredity, but did not know about ____": Mendel didn't know about sex chromosomes or sex - linked inheritance. So "sex chromosomes (or sex - linked inheritance)".

a. "Mendel only studied ____ traits": Mendel studied autosomal traits (traits not on sex chromosomes). So "autosomal".

b. "Expression of genes on sex chromosomes ____ from autosomal genes": The expression differs because sex chromosomes have different inheritance patterns (e.g., X - linked recessive affects males more). So "differs".

2a. "Genes located on sex - chromosomes called __ - __ genes": Sex - linked genes (X - linked or Y - linked, but generally "sex - linked").

Answer:

1. common

2a. are heterozygous (have the disease allele)
2b. undetected (not yet apparent)
E. sex

1. sex chromosomes (sex - linked inheritance)

a. autosomal
b. differs
2a. sex - linked