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1 year ago

A student inherited left handedness from parents who are both right handed. Explain the pattern of inheritance

Biology

2 answers:

Tatiana [17]1 year ago

8 0

Answer:

the left handedness was a recessive trait and skipped one or maybe multiple generations

Explanation:

Vaselesa [24]1 year ago

8 0

For a student to have inherited left handedness from parents who are both right handed, it means that the left-handed trait is recessive in both parents.

The pattern of inheritance of handedness can, thus, said to be simple dominant/recessive with the right handedness trait being dominant while the left handedness is recessive.

Let us assume that right-handedness is represented by the allele A and left-handedness by the allele a.

The two parents are heterozygous, hence, their genotypes each would be Aa.

Aa x Aa

AA Aa Aa aa

From the cross, 3/4 of their children would be right handed (AA or Aa) while 1/4 would be left handed (aa). The student in question must have been from the 1/4.

More about dominant/recessive traits can be found here: brainly.com/question/20744588

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2 years ago

In fruit flies, straight wings are dominant and curly wings are recessive. What will the generations look like? Assume that Mend

anzhelika [568]

Answer:

The P generation has straight wings and curly wings.

The F1 generation has all straight wings.

The F2 generation has straight wings and curly wings.

Explanation:

This question involves a single gene coding for wing shape in fruit flies. The allele for straight wings (S) is dominant over the allele for curly wings (s). This means that allele "S" will mask the phenotypic expression of allele "s" in a heterozygous state.

According to the question, the cross follows all Mendel's method of crossing two true breeding parents with opposite traits. Hence, the parent generation (P generation) will be between a truebreeding straight wings parent (SS) and a truebreeding curly wings parent (ss). (See attached image for full cross).

Since the straight wing allele (S) is dominant, all the F1 offsprings will possess straight wings with the genotype: Ss, which is heterozygous.

If this F1 offsprings are self-crossed i.e. Ss × Ss, four possible offsprings in the phenotypic ratio 3 straight wings : 1 curly wing will be produced in the F2 generation. The offsprings will possess the following genotypes: SS, Ss, Ss, and ss.

Offsprings SS, Ss, and Ss will all be phenotypically straight-winged

Offsprings ss will be phenotypically curly-winged.

In overall, this means that P generation has both straight and curly wings (SS and ss), F1 generation has only straight wings (Ss), F2 generation has both straight and curly wings (SS, Ss and ss).

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I hope this helped,

have a great day.

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