Question

spongebob and bikini bottoms genetics worksheet. scientists at bikini bottoms have been investigating the genetic makeup of the organisms in the community. use the information provided and your knowledge of genetics to answer each question. 1. for each genotype below, indicate whether it is a heterozygous (he) or homozygous (ho). tt __ bb dd ff tt dd dd ff tt bb bb ff a. which of the genotypes in #1 would be considered purebred? b. which of the genotypes in #1 would be hybrids? __

Explanation:

Step1: Recall genotype definitions

Homozygous has two identical alleles, heterozygous has two different alleles.

Step2: Classify genotypes

• TT: Homozygous (Ho) as both alleles are T.
• Bb: Heterozygous (He) as alleles are B and b.
• DD: Homozygous (Ho) as both alleles are D.
• Ff: Heterozygous (He) as alleles are F and f.
• tt: Homozygous (Ho) as both alleles are t.
• dd: Homozygous (Ho) as both alleles are d.
• Dd: Heterozygous (He) as alleles are D and d.
• ff: Homozygous (Ho) as both alleles are f.
• Tt: Heterozygous (He) as alleles are T and t.
• bb: Homozygous (Ho) as both alleles are b.
• BB: Homozygous (Ho) as both alleles are B.
• FF: Homozygous (Ho) as both alleles are F.

Step3: Identify pure - bred genotypes

Pure - bred means homozygous. So TT, DD, tt, dd, ff, bb, BB, FF are pure - bred.

Step4: Identify hybrid genotypes

Hybrid means heterozygous. So Bb, Ff, Dd, Tt are hybrids.

Answer:

TT: Ho, Bb: He, DD: Ho, Ff: He, tt: Ho, dd: Ho, Dd: He, ff: Ho, Tt: He, bb: Ho, BB: Ho, FF: Ho
A. TT, DD, tt, dd, ff, bb, BB, FF
B. Bb, Ff, Dd, Tt