Some Combinations of Recessive Alleles Cause Problems So Severe That

question 15

Multiple Choice

Some combinations of recessive alleles cause problems so severe that the fetus ceases to develop.Such lethal allele combinations appear to alter Mendelian ratios because

• A) the allele is masked in heterozygotes.
• B) carriers do not constitute a progeny class.
• C) they do not show a 1:2:1 genotypic ratio.
• D) homozygotes for the lethal allele do not appear as a progeny class.
• E) homozygotes for the lethal allele pass it on to half their offspring.

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Definitions:

Standard Deviation

A measure that is used to quantify the amount of variation or dispersion of a set of data values.

Standard Error

The typical variability or spread in the sampling distribution of a statistic, most commonly the mean, is referred to as the standard deviation.

T-statistic

The t-statistic is a ratio calculated from the difference between a sample mean and a population mean, divided by the standard error of the mean.

Null

Often refers to a hypothesis which assumes no significant difference or effect in a statistical analysis.