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Bio_Wdmn_REVIEW

Bio Common Assessment Qtr 3 Review

QuestionAnswer
A puppy is born with a spotted coat. What causes the puppy to look this way? The puppy inherited DNA for spots from its parents.
In an F1 cross, a purebred short corn plant is crossed with a purebred tall corn plant. All the offspring seeds result in tall plants. According to Mendel's work, this means "Tall" is... Dominant. Recessives hide, so the dwarf "short" plant is carried heterozygously.
A smiley that is homozygous for yellow nose is crossed with a smiley that is homozygous for red nose. In the case of INCOMPLETE dominance, the noses of offspring will be what color? RY = ORANGE RR= red YY= yellow
What is "crossing-over"? Sexual Reproduction involves crossing-over during MEIOSIS, resulting in genetic variation.
A black lab is crossed with a yellow lab. What explains why the offspring look the way they do? If ALL the offspring are black, then the parents were both homozygous... homozygous black BB and homozygous yellow bb. The offspring show the dominant condition but carry the recessive.
A black lab is crossed with a yellow lab, and some of the puppies are yellow. What does that tell you about the Black parent? The black parent must be heterozygous (Bb) if Some of its offspring showed the recessive phenotype instead.
Genotype ratio from a Heterozygous x Heterozygous monohybrid cross. 1:2:1 GG:Gg:gg
Homozygous Dominant x Heterozygous Use a Punnett square if needed... what is the PHENOTYPE ratio that will result? TT x Tt = TT, TT, Tt, Tt 100% will show the dominant trait.
Complete a Punnett square to show the result of a Dd x Dd breeding regarding D= dewclaws, d=absence of dewclaws. Dd x Dd = DD, Dd, Dd, dd 75% of the offspring has dewclaws 25% of the offspring will not.
In humans, nearsightedness is dominant. A man is nearsighted and his wife is normal-sighted. Name the two possible scenarios for parents and offspring. 1) NN (homozygous dominant man) x nn = all offspring Nearsighted Heterozygous Nn. 2) Nn (Het. man carries normal) x nn (normal wife) = 50% children Nearsighted, 50% normal-vision
What takes place in Prophase 1 of Meiosis? Duplicated chromosomes are supercoiled... they exchange material through crossing over. Nuclear envelope dissolves.
What takes place in Metaphase 1 of Meiosis? Homologous Chromosomes line up at the cell's equator in pairs.
What takes place in Anaphase 2 of Meiosis? Sister Chromatids separate and are pulled by spindle fibers to opposite ends of the pair of cells.
cells with a full set of genetic material diploid describes body (somatic) cells
cells with a HALF set of genetic material haploid described sex cells (gametes)
Two things that happen during meiosis that mix up parental genetic material - creating diversity... crossing-over (prophase1) independent assortment (metaphase1)
The function of meiosis is to create cells that are... genetically UNIQUE, with HALF the number of chromosomes as the germ cell... GAMETES!
Created by: biologewoodman
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