Question

complete this worksheet.

1. use the information for spongebob’s traits to write the phenotype (physical appearance) for each item.

(a) ll-________ (e) rr-________

characteristic	dominant gene	recessive gene
body shape	squarepants (s)	roundpants (s)
body color	yellow (y)	blue (y)
eye shape	round (r)	oval (r)
nose style	long (l)	stubby (l)

(b) yy-________ (f) ll-______ (c) ss-______ (g) ss-________
(d) rr - ________ (h) yy -________

1. use the information in the chart in #1 to write the genotype (or genotypes) for each trait below.

(a) yellow body - ________ (e) stubby nose - ______ (b) roundpants - ________
(f) round eyes - ________ (c) oval eyes - ______ (g) squarepants - ________
(d) long nose - ________ (h) blue body - ________

1. determine the genotypes for each using the information in the chart in #1.

(a) heterozygous round eyes -____ (c) homozygous long nose - __ (b) purebred squarepants - __ (d) hybrid yellow body - ____

1. one of spongebob’s cousins, spongebillybob, recently met a cute squarepants gal, spongegerdy, at a local dance and fell in love. use your knowledge of genetics to answer the questions below.

(a) if spongegerdy’s father is a heterozygous squarepants and her mother is a roundpants, what is her genotype? complete the punnett square to show the possible genotypes that would result to help you determine gerdy’s genotype.
what is gerdy’s genotype? __________
(b) spongebillybob is heterozygous for his squarepants shape. what is his genotype? __________
(c) complete the punnett square to show the possibilities that would result if billy bob & gerdy had children.

Explanation:

Step1: Solve Part 1(a)

For nose style, dominant gene is Long (L), recessive is Stubby (l). Genotype LL is homozygous dominant, so phenotype is Long nose.

Step2: Solve Part 1(b)

For body color, dominant is Yellow (Y), recessive is Blue (y). Genotype yy is homozygous recessive, so phenotype is Blue body.

Step3: Solve Part 1(c)

For body shape, dominant is Squarepants (S), recessive is Roundpants (s). Genotype Ss is heterozygous, so phenotype is Squarepants (dominant trait shows).

Step4: Solve Part 1(d)

For eye shape, dominant is Round (R), recessive is Oval (r). Genotype RR is homozygous dominant, so phenotype is Round eyes.

Step5: Solve Part 1(e)

For eye shape, genotype Rr is heterozygous, so phenotype is Round eyes (dominant trait shows).

Step6: Solve Part 1(f)

For nose style, genotype ll is homozygous recessive, so phenotype is Stubby nose.

Step7: Solve Part 1(g)

For body shape, genotype ss is homozygous recessive, so phenotype is Roundpants.

Step8: Solve Part 1(h)

For body color, genotype Yy is heterozygous, so phenotype is Yellow body (dominant trait shows).

Part 2:

Step1: Solve 2(a)

Yellow body is dominant (Y), so genotypes are YY (homozygous dominant) or Yy (heterozygous).

Step2: Solve 2(b)

Roundpants is recessive (s), so genotype is ss.

Step3: Solve 2(c)

Oval eyes is recessive (r), so genotype is rr.

Step4: Solve 2(d)

Long nose is dominant (L), so genotypes are LL (homozygous) or Ll (heterozygous).

Step5: Solve 2(e)

Stubby nose is recessive (l), so genotype is ll.

Step6: Solve 2(f)

Round eyes is dominant (R), so genotypes are RR (homozygous) or Rr (heterozygous).

Step7: Solve 2(g)

Squarepants is dominant (S), so genotypes are SS (homozygous) or Ss (heterozygous).

Step8: Solve 2(h)

Blue body is recessive (y), so genotype is yy.

Part 3:

Step1: Solve 3(a)

Heterozygous round eyes: round eyes is dominant (R), heterozygous means Rr.

Step2: Solve 3(b)

Purebred (homozygous) squarepants: squarepants is dominant (S), so SS.

Step3: Solve 3(c)

Homozygous long nose: long nose is dominant (L), so LL.

Step4: Solve 3(d)

Hybrid (heterozygous) yellow body: yellow is dominant (Y), so Yy.

Part 4:

Step1: Solve 4(a)

Father: heterozygous squarepants (Ss), Mother: roundpants (ss). Punnett square:

	S	s
s	Ss	ss

SpongeGerdy has squarepants (dominant trait), so her genotype is Ss (since mother is ss, she must get s, and to have squarepants, she gets S from father).

Step2: Solve 4(b)

Heterozygous squarepants: Ss.

Step3: Solve 4(c)

Billy Bob: Ss, Gerdy: Ss. Punnett square:

	S	s
s	Ss	ss

Answer:

(Partial, showing key parts as example for Part 1):

1. (a) Long nose; (b) Blue body; (c) Squarepants; (d) Round eyes; (e) Round eyes; (f) Stubby nose; (g) Roundpants; (h) Yellow body
2. (a) YY, Yy; (b) ss; (c) rr; (d) LL, Ll; (e) ll; (f) RR, Rr; (g) SS, Ss; (h) yy
3. (a) Rr; (b) SS; (c) LL; (d) Yy
4. (a) Ss; (b) Ss; (c) Punnett square as above

(Note: For full worksheet, each part follows the above logic of dominant/recessive trait inheritance.)