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Chapter 7 Biology Test

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23 pairs of chromosomes
DNA within each human body cell is organized into:
2 copies of the recessive allele for the trait are present
A recessive trait is expressed in an organism's phenotype when
Haploid Cells
Meiosis produces.. (figure picture)
Single copy of each chromosome
Compared with body cells, gametes are haploid because they contain a...
Phenotype
Your hair color, eye color, and height are all part of your individual..
Genetic crosses
Mendel learned about patterns of inheritance by carrying out controlled...
Alleles
What the letters R and r represent
The same form of a trait
Two homozygous alleles of a gene code for...
Genetic diversity
Independent assortment and crossing over increase
Particular alleles will be inherited
In both medicine and agriculture, biologists studying genetics try to determine the probability that...
Will not have the disorder
Someone who is heterozygous for a recessive allele that causes a disorder
Environment
Phenotype is influenced by many factors, including the chromosome upon which a gene is located, ranges of dominance and...
ss offspring
A cross between two parents who are heterozygous for an autosomal genetic disorder caused by a recessive allele. People with which genotype will have the disorder?
Polygenic
The wide range of eye color indicates that eye color is...
50%
One parent is homozygous for a recessive allele and one parent is heterozygous for a recessive allele in an autosomal dominant genetic disorder. What is the chance that a child of those two parents will have the disorder?
Homozygous for the recessive allele
An XX female will express a recessive sex-linked trait if she is...
White
Suppose a mouse is homozygous for alleles that produce black fur and homozygous for alleles of an epistatic gene that produces albinism. What color fur will the mouse have?
Traits are inherited as a group
The crossing of wild type fruit flies with mutant fruit flies resulted in the conclusion that some..
Not appear together
Two genes on a linkage map are 9 map units apart. This means that in 9 percent of the offspring, the phenotypes from those genes will...
Both her parents have the recessive allele
A female is born with attached earlobes, which is a recessive phenotype. Which of the following statements about her parents must be true?
Has the genetic disorder
Suppose a person is homozygous recessive for a recessive genetic disorder. This genotype means that the person...
Only females would be carriers of the disorder
If more males than females in a family have a recessive sex-linked disorder, what can you infer about patterns of inheritance in that family?
The map distance between C and A is less than the map distance between B and C
The gene linkage map shows the order of genes A, B, and C. What statement about the genes is true? (figure picture)
Has genes only for sex determination
Sex-linked disorders appear more often in males because the Y chromosome...
Karyotype
Down syndrome is characterized by having an extra copy of at least a portion of chromosome 21. What method would quickly identify the disorder?