Biology

Biology, 24.07.2019 06:00, babysitterwick

For most genes on the human x chromosome, what percent of xy males with a mutant allele on the x chromosome will express the mutant phenotype? question 1 choices choice a., 0% choice b., 25% choice c., 50% choice d., 100%

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Biology, 18.08.2019 06:10, itzia00

Why do recessive x-linked traits occur more frequently and with greater severity in human males than in human females? select all that apply. check all that apply males have an x chromosome, but females do not. males have an x chromosome, but females do not. males have two y chromosomes, so they never receive a dominant allele carried on an x chromosome. males have two y chromosomes, so they never receive a dominant allele carried on an x chromosome. males don’t have alleles from a second x chromosome to mask the effects of alleles on the first x chromosome. males don’t have alleles from a second x chromosome to mask the effects of alleles on the first x chromosome. in males, x inactivation shuts off expression of the alleles on one x chromosome. in males, x inactivation shuts off expression of the alleles on one x chromosome. only females who inherit two x-linked recessive alleles fully express the recessive phenotype. only females who inherit two x-linked recessive alleles fully express the recessive phenotype. sperm are more likely to carry an x chromosome than a y chromosome.

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Biology, 12.09.2019 22:30, Value31

Ayeast strain with a mutant spo11— allele (the mutant allele is nonfunctional; it makes no spoil protein) has been isolated. what do you suppose is the phenotype of this mutant strain?

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Biology, 07.11.2019 23:31, Mypage22

Suppose you are carrying out a series of crosses with an insect where the mechanism of determination is unknown. you discover a mutant female with short wings and decide to cross it with a wild-type male that has normal wings. none of the f₁ progeny have short wings but among the f₂ progeny 26% have short wings. however, all of these short-winged f₂ progeny are females. based on these results, a valid hypothesis would be . females are xx. males are xy and black wing scales are caused by n recessive allele on the x chromosome b. females are xx. males are xy and black wing scales are caused by a dominant allele on the x chromosome. c. females are zw. males are zz and black wing scales are caused by a recessive allele on the z chromosome. d. females are zw, males are 11 and black wing scales are caused by a dominant allele on the z chromosome.

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