Transcription of a gene can be blocked when which factor attaches to the operator?(1 point)

Question

Responses

promoter
promoter

RNA polymerase
RNA polymerase

repressor
repressor

exon

Answer 1

Transcription of a gene can be blocked when a repressor attaches to the operator.

Answer 2

A short pea plant is crossed with a tall, heterozygous pea plant. Use a Punnett square to determine the probability of short offspring.(1 point)
Responses

75%
75%

50%
50%

25%
25%

0%

Answer 3

To solve this problem, let's define the alleles:

• Let "T" represent the tall allele (dominant).
• Let "t" represent the short allele (recessive).

The genotypes we are working with are:

• The short pea plant has the genotype tt.
• The tall heterozygous pea plant has the genotype Tt.

Now we'll set up a Punnett square to determine the possible offspring:

        T     |     t
---------------------
   t |   Tt  |   tt
---------------------
   t |   Tt  |   tt

From the Punnett square, we see the possible genotypes for the offspring are:

• Tt (tall) - 2 squares
• tt (short) - 1 square

Therefore, the probability of having short offspring (tt) is 1 out of 4, which is 25%.

So the correct response is 25%.