Tay-Sachs, which is a recessive lethal disease, results only when individuals possess two copies of the disease-causing allele. Which of the following statements is true about this disease?
a) Heterozygous individuals are more fit than homozygous dominant individuals, so eventually, there will only be heterozygotes in the population.
b) Heterozygous individuals may pass on their copy of the disease-causing allele to offspring.
c) All cases of this disease must be caused by new mutations.
d) Heterozygous individuals only pass on the dominant copy of the allele to offspring.
e) A homozygous individual can pass on both of the recessive genes for Tay-Sachs.
Ans: b) Heterozygous individuals may pass on their copy of the disease-causing allele to offspring.
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