Question

(17) Differences in phenotype are called variations. Which of the following types of variations occur?

(A) harmful (B) neutral

(C) helpful (D) all of the above

(24) An Organism's Phenotype refers to its:

(A) genetic composition (B) physical traits

(C) both genetic compositions or its physical traits (D) neither its genetic composition or its physical traits

(25) In Mendelian genetics,_____allele(s) determine the production of a particular physical trait (or characteristics).

(A) one (B) two

(C) three (D) four

Answer 1

Answer = (D) all of the above

Explanation =

Differences in phenotype are called variations. the following types of variations occur harmful ,neutral,  helpful.

example of harmful variations - sickle cell anemia .

the variation causes lightning of skin and hair color due to lack of formation of melanin.

useful variations - some of the variations are useful like as eye color, body form and disease resistance

neutral variations - are the variations consists of differences in DNA sequences in populations that is dows not advantageous or disadvantageous.

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(24) An Organism's Phenotype refers to its:

(B) physical traits

Explanation = An Organism's Phenotype refers to its physical trait. the physical trait is also called as phenotypes.it is a physical appearance like as color, hair length , height etc.

the physical trait is determined by genotypes.

genotype is the set of genes within an organism.

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(25) B. Two

Explanation =

In Mendelian genetics,_Two____allele(s) determine the production of a particular physical trait (or characteristics).

two alleles deretmine the production of a particular trait or characteristics. one of the allele is dominant and other is recessive.

for example- the allele YY - determine the yellow color in pea plant- dominant allele.

yy - determine the green color.- recessive allele