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If a man carries a recessive sex-linked trait on his X chromosome, what is the possibility that his children will inherit the disease if their mother is not a carrier of the disease?
0%
100%
75%
50%
In guinea pigs, black hair is dominant over white hair. If a homozygous black guinea pig (father) were crossed with a homozygous white guinea pig (mother), the first generation of offspring would be all black.
Match the mother's and father's genotypes and phenotypes to their correct description.
1.mother's phenotype
2.father's phenotype
3.father's genotype
4.mother's genotype
a.black
b.HH
c.white
d.hh
A condition in which both alleles of a heterozygous condition are expressed as a blending of traits is ______.
incomplete dominance
sex-linked
transformation
crossing over
During which phase of meiosis does variation occur?
anaphase I
cytokinesis
interphase
telophase I
Male cats are either black (B) or orange (O). Females are black, orange, or calico, which has patches of black and orange. Calico is formed from the codominance between the two alleles in the heterozygote, so a calico cat is (XB XO). Give the genotype and phenotype ratio of a cross between an orange male cat and a calico cat.
The trait that is masked by the dominant trait is the _____ trait.
recessive
cross
purebred
hybrid
The seeds of the common dandelion, Taraxicum officinale, grow wherever the seeds are blown by wind. This is an example of population dispersion known as ____________.
What is the largest human organ?
R0 is: a) The death rate as a result of pathogen infection b) The percentage of a population that must be infected/vaccinated to achieve herd immunity c) The transmissibility of the pathogen, how many people an infected person is expected to infect d) The rate of morbidity (suffering/disease) as a result of pathogen infection e) The rate of full recovery from pathogen associated disease
What distinguishes what the Chinese first practiced for variolation from what Edward Jenner did? a) The Chinese used cowpox virus scabs, not smallpox virus scabs which Jenner used b) The Chinese used smallpox virus for variolation two times per person, Jenner smallpox only once per person c) Edward Jenner combined smallpox scabs with scabs from bacterial infections d) Edward Jenner used cowpox virus scabs, not smallpox virus scabs which the Chinese used e) There is no distinction, both the Chinese and Jenner used smallpox virus scabs twice per person for maximum effectiveness
Free fatty acids can move from adipose tissue to the liver or muscles in the bloodstream by: (select one)
a. associated with serum albumin
b. use special cofactors carriers
c. independent water-soluble compounds
d. use erythrocyte receptors
e. use modifying enzymes
