An allele that can be masked or suppressed by another allele is said to be __________.
Recessive
An organism with three pairs of homologous chromosomes statistically could produce __________
different gametes strictly on the basis of independent assortment.
Which of the following is NOT a source of genetic variation?
A)
independent assortment of chromosomes
B) crossover of
homologs
C) age of either or both parents
D) random
fertilization of eggs by sperm
C. age of either or both parents
What is the probability of the same couple having three boys in a row?
1/8
Skin color, controlled by three separately inherited genes that each exist in two allelic forms (A, a; B, b; C, c), is an example of which form of inheritance?
Polygene Inheritance
Genes on the same chromosome are said to be __
Linked
What is the probability of having a recessive trait child if both parents are heterozygous for the trait?
25%
A person without a Y chromosome will ____________________.
be a female
One possible scientific explanation for siblings having very different skin color is ________.
polygene inheritance, which results in continuous phenotypic variation between extremes
Two alleles expressing exactly the same information for a trait are designated as ________.
homozygous
Those characteristics that can be determined on superficial inspection of an individual are known as ________.
homozygous
True or False
Hereditary characteristics are transmitted to offspring by genes.
True
The most common form of fetal testing is ____________________.
Blood chemistry
The diploid genome contains chromosomes from ________.
Both the mother and father, but only about half of the genome from each.
True or False
Some segments of the Y chromosome have no counterpart on the X chromosome.
True
True or False
When two genes are on the same chromosome, they are considered linked.
True
The gene responsible for the condition known as sickle-cell anemia demonstrates ___.
incomplete dominance
True or False
Most genetic disorders are inherited through dominant genes.
False
True or False
Hemophilia is an X-linked condition caused by a recessive gene.
True.