S S S or y Gametes Gametes (A) F, gametes 4 sY 4 sy V4 SY 4 Sy SSYY SsYy SSYY SSYY 4 SY 46 46 V46 46 SSyy SsYy Ssyy SSYY V4 Sy 46 16 16 46 SSYY ssYy Ss YY SsYy V4 SY 46 46 46 46 Ss Yy Ssyy ssYy ssyy VA sy 46 46 (B) FIGURE 16-17 (A) During anaphase I, chromosomes move independently of each other, so one pole receives S and the other receives s; likewise, one gets Y and the other y. But in about half the cells, both S and Y move to the same spindle pole by chance, whereas in other dividing cells, one spindle pole receives S and y, again by chance. (B) A Punnett square for a dihybrid cross is set up just like one for a monohybrid cross; establish the types and relative abundance of gametes, and then fill in the squares. The table looks a little formidable, but it really consists of two 3:1 ratios intermingled. F, gametes

S S S or y Gametes Gametes (A) F, gametes 4 sY 4 sy V4 SY 4 Sy SSYY SsYy SSYY SSYY 4 SY 46 46 V46 46 SSyy SsYy Ssyy SSYY V4 Sy 46 16 16 46 SSYY ssYy Ss YY SsYy V4 SY 46 46 46 46 Ss Yy Ssyy ssYy ssyy VA sy 46 46 (B) FIGURE 16-17 (A) During anaphase I, chromosomes move independently of each other, so one pole receives S and the other receives s; likewise, one gets Y and the other y. But in about half the cells, both S and Y move to the same spindle pole by chance, whereas in other dividing cells, one spindle pole receives S and y, again by chance. (B) A Punnett square for a dihybrid cross is set up just like one for a monohybrid cross; establish the types and relative abundance of gametes, and then fill in the squares. The table looks a little formidable, but it really consists of two 3:1 ratios intermingled. F, gametes

Name: We say that genes that are close together on the same chromosome are l
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Description: We say that genes that are close together on the same chromosome are linked. What does that mean? Imagine that in a diploid nucleus, one chromosome has the allele R and right next to it on the same chromosome is the allele T for a different gene. Are

Biology: The Unity and Diversity of Life (MindTap Course List)

15th Edition

ISBN:9781337408332

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter14: Chromosomes And Human Inheritance

Section: Chapter Questions

Problem 5GP: Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With...

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How many types of gametes are produced when linkage is complete and the diploid number is 2? Thank you!
Shown below are photomicrographs of Rhoeo tradescantia cells undergoing meiosis. Answer the following question for each of the photomicrographs: Identify the cytogenetic abnormality observed (ex. ring, chain, laggard, bridge). Identify the meiotic stage in which these aberrations are observed (as shown in the photomicrograph). Explain how these aberrations are formed and relate to the possible causal mutation(s). Will this result to sterile and/or fertile gametes? Explain.
This problem leads you through the derivation of acorrected equation for RF in yeast tetrad analysis thattakes into account double crossover (DCO) meioses. A yeast strain that cannot grow in the absence ofthe amino acid histidine (his−) is mated with a yeaststrain that cannot grow in the absence of the aminoacid lysine (lys−). Among the 400 unordered tetrads resulting from this mating, 233 were PD, 11 wereNPD, and 156 were T.a. What types of spores are in the PD, NPD, andT tetrads?b. Are the his and lys genes linked? How do you know? c. Using the simple equation RF = 100 × [NPD +(1/2)T]/total tetrads, calculate the distance in mapunits between the his and lys genes.d. If you think about all the kinds of meiotic eventsthat could occur (refer to Fig. 5.24), you can seethat the calculation you did in part (c) may substantially underestimate RF. What kinds of meioses(NCO, SCO, or DCO) generated each of the tetradtypes in this cross? e. What incorrect assumptions does the simple RFequation…
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