Biology

Biology, 02.10.2019 22:00, Oliviapuffinburger33

In humans, have a larger sex chromosome.

males

females

both a and b

none of the above

answer

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Biology, 24.06.2019 19:20, ynclankaedon

How do mammals, including humans, solve the "dosage problem" caused by the presence of an x and y chromosome in one sex and two x chromosomes in the other sex? a. they don't; the fact that females have twice as much x chromosome protein products as males is critical for sex determination in mammals.b. females produce twice the rna transcripts as males do, but in females half of them are destroyed before being translated.c. in males, the x chromosome is up-regulated so that its genes are transcribed and translated twice as much as the x chromosomes in females.d. in females, one of the x chromosomes is condensed and largely inactive so that each sex has one active x chromosome.e. male rna transcripts from the x chromosome have leaders that cause them to be translated at twice the rate as those in females.f. they don't, but the x chromosome contains genes whose expression is not quantitatively sensitive, so the differences are not important.

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Biology, 23.07.2019 08:30, hvbrown28

In humans, females inherit an x chromosome from each parent; males inherit their x chromosome from their mother and their y chromosome from their father. the same is true of all other placental mammals: males produce x and y gametes, and females produce only x gametes. in this system, referred to as the xx-xy system, maleness is determined by sperm cells that carry the y chromosome. yet the xx-xy sex determination system does not occur in all animal species. it is only one of a variety of systems within the animal kingdom. above are punnett squares illustrating three examples of gender inheritance patterns: humans, insects and birds. consider both the illustration and the text. compare the inheritance system of bird with that of humans.

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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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In humans, have a larger sex chromosome.

males

females

both a a...

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