TLS Online TPP Program

#Question id: 1984


Which of the following is a pathway that would lead to the activation of cytotoxic T cells?

#Section 2: General Biology
  1. B cell contact antigen → helper T cell is activated → clonal selection occurs

  2. body cell becomes infected with a virus → new viral proteins appear → class I MHC molecule-antigen complex displayed on cell surface

  3. self-tolerance of immune cells → B cells contact antigen → cytokines released

  4. complement is secreted → B cell contacts antigen → helper T cell activated → cytokines released

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TLS Online TPP Program

#Question id: 3523

#Section 3: Genetics, Cellular and Molecular Biology

If the number of heterozygous pairs involved in a particular cross is three, the phenotype ratio obtained in their F2 generation will be-

TLS Online TPP Program

#Question id: 3524

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following genotypes would produce the greatest variety of gametes of the alleles assorted independently?

TLS Online TPP Program

#Question id: 3525

#Section 3: Genetics, Cellular and Molecular Biology

In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype was crossed with rrtt plant results progeny, are

TLS Online TPP Program

#Question id: 3527

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following genetic cross would produce 1/4 yellow round, 1/4 yellow wrinkle, 1/4 Green round and ¼ Green Wrinkle seeded plant?

TLS Online TPP Program

#Question id: 3528

#Section 3: Genetics, Cellular and Molecular Biology

Consider the following cross:

A/a ; B/b ; C/c ; D/d ; E/e  X a/a ; B/b ; c/c ; D/d ; e/e

What proportion of progeny will phenotypically resemble the first parent?

TLS Online TPP Program

#Question id: 3529

#Section 3: Genetics, Cellular and Molecular Biology

Mendel crossed tall and round seeded pea plants with dwarf and wrinkle seeded pea. The F1 plants were all tall and round seed. What is the probability of tall plant with wrinkle seed in F2 generation?