16 8 Multiple Choice The allele that causes Huntington disease in humans is an example of a or an that exerts its effects later in life. lethal allele environmental effect semilethal allele recessive allele epistatic allele
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Step 1: The question asks to identify the type of allele that causes Huntington disease, specifically noting that it exerts its effects later in life. Show more…
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Multiple alleles are described when a trait is controlled by more than two alleles, and that even if a trait is controlled by more than two alleles each offspring still only inherits two. Epistasis occurs when the expression of a gene is controlled by the expression of another gene. Lethal alleles or lethal genes are alleles that cause the death of the organism that carries them. Lethal alleles are recessive, dominant, or conditional depending on the genes involved. It can lead to the death of an organism and it can manifest early in development. Question: Are these alleles common or rare in humans? Answer this question in not more than 3 sentences.
Sri K.
Match the following terms with the most appropriate description/scenario (you will not use them all): - Height in humans is an example of _________________ because six alleles from three different genes contribute additively to the phenotype of an individual. - Huntington's disease is an example of a ____________________ allele because both the heterozygous and homozygous dominant individuals do not survive. - A true-bred black cat and a true-bred tan cat mate. Their kittens all have equal amounts of black hair and tan hair (black and tan are two alleles of the same gene). - In Albinism, a mutation in gene "A" affects more than one trait in the affected individual (i.e. hair color and skin color). Therefore, in humans, the "A" gene is ________________. - In humans, arthritis can result from both a genetic cause and an environmental cause. - In pea plants, pods can be green (dominant trait, G) or yellow (recessive trait, s). All peas that are heterozygous (Gg) have green pods. - In certain breeds of guinea pigs, the bb genotype results in a dark coat color instead of white. Analysis of 50 bb guinea pigs shows that 50 of them are black, 40 are dark gray, and 10 are light gray. - Dominant mutations in the Rb gene result in retinoblastomas - childhood eye tumors. However, about 10% of individuals who inherit this mutation never develop a tumor. - Many myopathies are inherited exclusively from a mother to all of her children (but never from a father to any of his children). This is an example of _____________________. A. Pleiotropic B. Multifactorial Trait C. Heteroplasmy D. Dominant lethal E. Incomplete Dominance F. Complete Dominance G. Incomplete Penetrance H. Polygenic inheritance I. Uniparental inheritance J. Variable expressivity K. Codominance L. Recessive lethal
Adi S.
'An allele that is not expressed in the heterozygous condition recessive dominant genotypic. phenotypic. lethal:'
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