Which of the following is/are a plausible reason why all human populations contain lethal recessive alleles? More than one answer may be correct.
Selection cannot "see" lethal recessive alleles when they are in heterozygotes.
If mating is random, as the frequency of a lethal recessive allele decreases, the proportion hidden in heterozygotes increases.
Dominant lethal alleles typically mutate quickly into recessive lethal alleles.
When a lethal recessive allele is rare, it can be re-created by mutation as quickly as it's being removed by selection.
Which of the following is/are a plausible reason why all human populations contain lethal recessive alleles? More than one answer may be correct.
Selection cannot "see" lethal recessive alleles when they are in heterozygotes. | |
If mating is random, as the frequency of a lethal recessive allele decreases, the proportion hidden in heterozygotes increases. | |
Dominant lethal alleles typically mutate quickly into recessive lethal alleles. | |
When a lethal recessive allele is rare, it can be re-created by mutation as quickly as it's being removed by selection. |
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Need help with evolution questions:
1.) A haplotype is best defined as the ________________.
haploid genotypes of all the gametes produced by a diploid individual | |
ABO blood type conferred by an individual gamete |
genotype of either the paternal or maternal chromosomal complement |
multilocus genotype of a chromosome or gamete |
2.) Which of the following statements regarding linkage disequilibrium is true?
Exists when D is less than zero, but not when it is greater than zero. |
Is reduced by sexual reproduction. |
Is increased by crossing-over during meiosis. |
Is increased by any random sampling error that happens to create or destroy certain chromosome genotypes but not others. |
Is reduced by selection that favors certain combinations of genotypes. 3.) Selection on multilocus genotypes in random-mating populations leads to linkage disequilibrium when _______________.
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