T
travis p
Guest
All the offspring of a cross between a black-eyed mendelien and an orange-eyed mendelien have black eyes. This means that the allele for black eyes is ________ the allele for orange eyes.
a.codominant to
b.recessive to
c.more aggressive than
d.dominant to
e.better than
2. The alleles of a gene are found at ________ chromosomes.
a.the same locus on homologous mitochondrial
b.the same locus on heterologous
c.different loci on homologous
d.different loci on heterologous
e.the same locus on homologous
3. Which of the following statements best explains why dominant alleles that cause lethal disorders are less common than recessive alleles that cause lethal disorders?
a. Lethal disorders caused by dominant alleles are usually more severe than lethal disorders caused by recessive alleles.
b. Unlike lethal disorders caused by recessive alleles, lethal disorders caused by dominant alleles usually cause the death of the embryo.
c.Most individuals carrying a lethal dominant allele have the disorder and die before they reproduce, whereas individuals carrying a lethal recessive allele are more likely to be healthy and reproduce.
d. The presence of a lethal dominant allele causes sterility.
e.Many lethal recessive alleles cause enhanced disease resistance when they are present in the heterozygous state, and carriers of these alleles have more children, on average, than other people.
4. For most sexually reproducing organisms, Mendel's laws
a.cannot strictly account for most patterns of inheritance.
b.explain the reasons why certain genes are dominant.
c.help us understand the global geographic patterns of genetic disease.
d.indicate if a particular genotype will cause a certain phenotype.
e.clarify the phenomenon of incomplete dominance.
5. Which of the following statements is false?
a.Incomplete dominance supports the blending hypothesis.
b.Heterozygotes for hypercholesterolemia have blood cholesterols about twice normal.
c.The four blood types result from various combinations of the three different ABO alleles.
d.ABO blood groups can provide evidence of paternity.
e.The impact of a single gene on more than one character is called pleiotropy.
6. Two identical twins are raised in different environments. They possess _____ genotypes and _____ phenotypes.
a.identical … identical
b.identical … variable
c.identical … dissimilar
d.contrasting … identical
e.variable … contrasting
a.codominant to
b.recessive to
c.more aggressive than
d.dominant to
e.better than
2. The alleles of a gene are found at ________ chromosomes.
a.the same locus on homologous mitochondrial
b.the same locus on heterologous
c.different loci on homologous
d.different loci on heterologous
e.the same locus on homologous
3. Which of the following statements best explains why dominant alleles that cause lethal disorders are less common than recessive alleles that cause lethal disorders?
a. Lethal disorders caused by dominant alleles are usually more severe than lethal disorders caused by recessive alleles.
b. Unlike lethal disorders caused by recessive alleles, lethal disorders caused by dominant alleles usually cause the death of the embryo.
c.Most individuals carrying a lethal dominant allele have the disorder and die before they reproduce, whereas individuals carrying a lethal recessive allele are more likely to be healthy and reproduce.
d. The presence of a lethal dominant allele causes sterility.
e.Many lethal recessive alleles cause enhanced disease resistance when they are present in the heterozygous state, and carriers of these alleles have more children, on average, than other people.
4. For most sexually reproducing organisms, Mendel's laws
a.cannot strictly account for most patterns of inheritance.
b.explain the reasons why certain genes are dominant.
c.help us understand the global geographic patterns of genetic disease.
d.indicate if a particular genotype will cause a certain phenotype.
e.clarify the phenomenon of incomplete dominance.
5. Which of the following statements is false?
a.Incomplete dominance supports the blending hypothesis.
b.Heterozygotes for hypercholesterolemia have blood cholesterols about twice normal.
c.The four blood types result from various combinations of the three different ABO alleles.
d.ABO blood groups can provide evidence of paternity.
e.The impact of a single gene on more than one character is called pleiotropy.
6. Two identical twins are raised in different environments. They possess _____ genotypes and _____ phenotypes.
a.identical … identical
b.identical … variable
c.identical … dissimilar
d.contrasting … identical
e.variable … contrasting