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earnstyle [38]
3 years ago
8

Alex had two black rats (dominant). He allowed his black rats to mate and was shocked to see that three of the rat babies were b

lack and one was an albino! What genotypes were the parents?
Biology
2 answers:
Anton [14]3 years ago
8 0

i think it is co-dominant

jeka943 years ago
8 0

In order for the off springs to have a 3:1 ratio, the parents must have been heterozygous. Both blacks rats must have carried the dominant allele and a recessive allele.

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Answer:

  • 25 tall individuals, TT
  • 50 medium individuals, Tt
  • 25 short individuals, tt

Explanation:

<u>Available data</u>:

  • The size of this species was determined by a single gene
  • TT- Tall
  • Tt- Medium
  • tt- Short
  • Total number of individuals in the progeny, N = 100

There are three phenotypes and only one gene, so it seems that this is an example of incomplete dominance, where the medium-size is the intermediate form between tall-size and short-size.  

Cross: between two medium Gazorps

Parentals) Tt    x    Tt

Gametes) T  t       T   t

Punnett square)    T           t

                    T       TT         Tt

                    t        tT          tt

F1) 1/4 = 25% TT, tall

    2/4 = 1/2 = 50% Tt, medium

    1/4 = 25% tt, short

100% of the progeny ------------ 100 individuals

25% Tall, TT ------------------------X = 25 individuals

50% Medium, Tt -------------------X = 50 individuals

25% Short, tt ------------------------X = 25 individuals

5 0
3 years ago
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