Question
Asked Oct 3, 2019
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Examine the following crosses among sea stars and the resulting colors of the offspring and decide what type of inheritance is involved. Then, indicate the genotypes of the parents and offspring involved in each of the crosses in the blanks provided.

 

Parents
Offspring
Pod Length
Parent 1
Parent 2
4 Blue
Green
Green
2Green
4 Yellow
Blue
Blue
all Blue
Yellow
all Yellow
Yellow
½ Blue
Blue
Green
2 Green
Yellow
Green
½ Yellow
½ Green
all Green
Blue
Yellow
Pattern of inheritance for sea star body color:
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Parents Offspring Pod Length Parent 1 Parent 2 4 Blue Green Green 2Green 4 Yellow Blue Blue all Blue Yellow all Yellow Yellow ½ Blue Blue Green 2 Green Yellow Green ½ Yellow ½ Green all Green Blue Yellow Pattern of inheritance for sea star body color:

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Expert Answer

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Step 1

Inheritance is the process of transmitting the traits from parent to offspring. Traits of an organism are controlled by genes (small segment on DNA) which have two or more contrasting pairs known as allele.

Step 2

In the given case, there are three body colors of sea star, namely, green, blue and yellow, where green color is also intermediate color of blue and yellow. If blue color is homozygous dominant (AA), yellow color is homozygous recessive (aa) and green color is heterozygous (Aa), crossing the parents according to the phenotypes given in table as follows:

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Phenotype of offspring 4 Blue Parent 1 Parent 2 Punnett cross Green (Aa) Green (Aa) a ½ Green /4 Yellow AA Aa Аa аa Blue (AA) Blue (AA) All blue А A AA AA A AA AA All Yellow Yellow (aa) Yellow (aa) а aa aa aa aa Blue (AA) Green (Aa) ½ Blue А Green AA AA Aa Aa a Yellow (aa) ½ Yellow Green (Aa) а ½ Green A Aa Aa a aa aa Blue (AA) Yellow (aa) All green А Aa Aa a Aa Aa a

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Step 3

Considering the assumed case and observed results, it has been determined that the above case of sea star body color inheritance has ‘incomplete inheritance’ pattern. In inc...

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