Consider a group of 100 individuals (50 couples), all of whom carry a recessive disease allele. If 200 children were born to these couples, what percentage of the children would, theoretically, be carriers like their parents?
Correct answer: C. 50
- A. 0
- B. 25
- C. 50
- D. 75
Explanation
Since all the parents are heterozygotes each couple produces 4 children and in them, one is homozygous one is recessive and 2 are heterozygotes. So if each couple has 2 heterozygote children (carrier) 50 couples would have 100 children which is 50% of total of 200
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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