When a homozygous plant that produces purple fruit (PP) is crossed with a homozygous plant that produces white fruit (pp), all the heterozygous F1 (Pp) produce violet fruit If an F1 eggplant is used in a testcross, what proportion of the progeny from this cross will be white?

TLS Online TPP Program

#Question id: 12370

#Unit 1. Molecules and their Interaction Relevant to Biology

Dideoxy ribose sugar contains

TLS Online TPP Program

#Question id: 1988

#Unit 4. Cell Communication and Cell Signaling

What are CD4 and CD8?

TLS Online TPP Program

#Question id: 10586

#Unit 10. Ecological Principles

Which of the following factors may not change carrying capacity over time?

TLS Online TPP Program

#Question id: 12909

#Unit 13. Methods in Biology

According to the diagram, arrange the steps in correct order: 

1. DNA is then digested by the Cas9 nuclease at specific points on both DNA strands. 

2. Homologous recombination to repair the break and incorporate the new DNA sequence then follows. 

3.The nuclease Cas9 is targeted to DNA by a guide RNA consisting of a specific 20 nucleotide spacer/targeting sequence (crRNA).

 4. That identifies the DNA to be modified, linked to a trans-activating (tracrRNA) sequence necessary for the recruitment and stability of Cas9 nuclease.

TLS Online TPP Program

#Question id: 28431

#Unit 5. Developmental Biology

Which of the following cells direct the movement of the primitive streak in avian development?