In Question 23, if one chromosome has R and T and the homologous chromosome also has R and T, does linkage matter? What is the single type of genotype that this plant can produce in its gametes?

Question 23

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 these linked? Imagine that r is right next to t on the homologous chromosome. If this cell never undergoes meiosis, does this matter at all? If it does undergo meiosis, what are the two genotypes that the gametes are most likely to have? Look at Figure 16-17 for help if you need it.

Figure 16-17

Transcribed Image Text:

S (A) F₁ gametes ¼ SY A Sy LASY VA SY S 180 10 110 Gametes S > SSYY 146 SSYY 1/416 SSYY 1 SY SsYy 146 5) - SSYY 1446 14 Sy SSyy 146 SsYy 1/10 or Ssyy 146 S P F₁ gametes ¹ SY SsYY 1/6 Ss Yy 1/46 SSYY 1/6 ssyy 1/6 S 200 1300 S Y| | Y Gametes SsYy 1/16 1 Sy Ssyy 140 ss Yy ¹1416 sfly ssyy S