Question

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punnett square practice
directions: use the step by step instructions on the front of the page to complete the punnett squares for each problem.

1. in pea plants, tall (t) is dominant and short (t) is recessive. complete the punnett square for the following cross: mother: tt father: tt

what percentage of offspring will be tall?
what percentage of offspring will be short?

1. in a certain flower, red (r) is dominant over white (r). complete the punnett square for the following cross: mother: rr father: rr

what percentage of offspring will be red?
what percentage of offspring will be white?

1. in chickens, black feathers (b) are dominant over white feathers (b). complete the punnett square for the following cross:

mother: bb father: bb
what percentage of offspring will be black?
what percentage of offspring will be white?

1. in a certain flower, red (r) is dominant over white (r). complete the punnett square for the following cross: mother: rr father: rr

what percentage of offspring will be red?
what percentage of offspring will be white?

Explanation:

Problem 1:

Step1: Determine gametes

Mother (TT) can only produce T gametes. Father (Tt) can produce T and t gametes.

Step2: Fill Punnett square

	T	T
t	Tt	Tt

Step3: Calculate tall (T_) offspring

All 4 squares have T_ (TT or Tt), so tall percentage: $\frac{4}{4} \times 100 = 100\%$. Short (tt) offspring: 0, so short percentage: $0\%$.

Step1: Determine gametes

Mother (Rr) produces R and r gametes. Father (rr) produces r gametes.

Step2: Fill Punnett square

	R	r
r	Rr	rr

Step3: Calculate red (R_) offspring

Rr is red, so 2 out of 4. Red percentage: $\frac{2}{4} \times 100 = 50\%$. White (rr) offspring: 2 out of 4, so white percentage: $50\%$.

Step1: Determine gametes

Mother (BB) produces B gametes. Father (bb) produces b gametes.

Step2: Fill Punnett square

	B	B
b	Bb	Bb

Step3: Calculate black (B_) offspring

All 4 are Bb (black), so black percentage: $\frac{4}{4} \times 100 = 100\%$. White (bb) offspring: 0, so white percentage: $0\%$.

Answer:

Tall: 100%, Short: 0%

Problem 2: