handed shell (d), called sinistral. A pet snail called Moses is sinistral 31) Mo

Question

handed shell (d), called sinistral. A pet snail called Moses is sinistral 31) Moses's genotype must be dd 32) Reforiing to above, Moses's genotype cannot be DD 33) Referring to above All the offspring produced by Moses must be sinistral 34) Referring to above, Moses's mother must have been sinistral 35) This inheritance pattern occurs when traits occur only in one of the two sexes B) False A True B) False A) True B) A) True B) False A) sex-linked trait D) Y-linked trait B) sex-limited trait C) sex influenced trait E) lethal recessive trait 36) If 80% of heterozygotes carrying a dominant mutant allele exhibit the trait for the allele, the trait is penetrant , A) 20% B) 30% C)40% D) 80% E) 100% 37) allele causes some people to have more than five fingers and toes. is the degree to which a trait is expressed. For example; a dominant mutant A) Penetrance D) codominance B) Expressivity C) lethal alleles E) incomplete dominance 38) This inheritance pattern involves the inheritance chloroplast? of genes that are found in mitochondria or A) genomic imprintingB) dosage compensation D) maternal effect C) sex influenced trait E)maternal (extranuclear) inheritance 39) This inheritance pattern occurs when a segment of DNA is marked and the effect is maintained throughout the life of the organism inheriting the marked DNA A) maternal D) maternal effect B) dosage compensation E) genomic imprinting C) sex influenced trait inheritance 40) This is when mitochondria have both mutant and wild type alleles for a particular trait. C) hemizygous D) epigenetic inheritance A) homoplasmy Bheteroplasmy E) incomplete dominance Questions 41 to 44 are connected In tomatoes, dwarf (d) is recessive to tall (D) and opaque (light green) leaf (g) is recessive to green leaf G). The laci that deternine height and leaf color are liked and eparated by a distance of 10 map units a. D G

Explanation / Answer

Coiling of the shell in dextral or sinistral pattern is a maternal inheritance effect, meaning that the shell pattern of mother will be inherited by the progeny disregarding the genotype of the progeny. The right-coiling allele, D, is dominant to the left-coiling allele, d. However, the direction of cleavage is determined not by the genotype of the developing snail, but by the genotype of the snail’s mother. A dd female snail can produce only sinistrally coiling offspring, even if the offspring’s genotype is Dd. A Dd individual will coil either left or right, depending on the genotype of its mother. Based on this, the above questions can be answered as follows:

1) False

2) True

3) False

4) True

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