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WorksheetsHeredity
Total questions: 25
Worksheet time: 27mins
Having two identical alleles for a particular gene, such as GG or gg
Homozygous
Dominant
Heterozygous
Recessive
having two different alleles for a particular gene, such as Gg
Homozygous
Dominant
Recessive
Heterozygous
Which of the following are sex chromosomes in human beings?
W
X
G
Y
What are the characteristics of human sex chromosomes?
Sex chromosomes are always identical pairs.
Females are determined by a pair of similar chromosomes.
Males are determined by a pair of dissimilar chromosomes.
The Y chromosome is larger than the X chromosome.
This trait always shows up in an organism when the allele is present
dominant allele
codominance
probability
recessive allele
This trait is hidden whenever the dominant allele is present
dominant allele
codominance
recessive allele
Punnett Square
Heredity is
the passing of traits from parents to offspring
the passing of money to parents
genes
alleles affect inheritance
a dominant allele is
a hidden gene
traits always shows up in the organism when the allele is present
the number that describes how likely an event is to occur
selective breeding
recessive allele
hidden when dominant is present
dominant allele
always present
GG
Chromosomes are
Found in the mitochondria
Made of 20 pairs
Long strands of DNA that contain many genes
Bundles of DNA that contain only one gene each
Chromosomes consist of:
pairs of nucleic acids.
long strands of tightly coiled DNA.
a single gene.
autosomes.
The genetic information in male offspring is:
inherited from both the father and the mother.
inherited from only the father.
inherited from only the mother.
unique from that of either parent.
Female offspring result when:
a sperm with a Y chromosome fertilizes the egg.
a sperm with an X chromosome fertilizes the egg.
an egg with a Y chromosome is fertilized by a sperm with an X chromosome.
a sperm with two X chromosomes fertilizes the egg.
An alternative form of a gene is called:
a locus.
a genome.
an allele.
a karyotype.
Which of the following statements about alleles is correct?
A dominant allele cancels out a recessive allele and the trait is suppressed.
A recessive allele is expressed only when the corresponding allele is absent.
If a person has two alleles that are the same, the person is said to be heterozygous.
An individual may have two alleles that are the same or two alleles that are different.
Which of the following statements about sex-linked inheritance is correct?
Almost all of the sex-linked traits are carried on the X chromosome and are recessive.
Almost all of the sex-linked traits are carried on the X chromosome and are dominant.
Almost all of the sex-linked traits are carried on the Y chromosome and are recessive.
Almost all of the sex linked traits are carried on the Y chromosome and are dominant.
Most common chromosomal abnormalities result when:
homologous chromosomes separate repeatedly.
homologous chromosomes fail to separate during meiosis.
an egg is fertilized by more than one sperm.
a mutation occurs.
A complete set of genetic information for one person
Homozygous
Heterozygous
Genome
Chromosomes
Which chromosomes occur in equal pairs in both males and females and do not determine sex?
Gametes
Autosomes
Genes
Chromosomes
How many chromosomes do all human cells contain, except germ cells?
46 pairs
22 pairs
23
46
What is determined by the presence or absence of certain chromosomes?
Gender
Allele
Locus
Codominant
When two alleles for the same trait are both expressed.
Heterozygous
Homozygous
Codominant
Locus
If a person has a recessive allele for a trait, but that trait doesn't show, then you know the are __________ for that trait.
Homozygous
Heterozygous
Codominant
Genome
What is the location of a gene called?
Karyotype
Allele
Genome
Locus
