Question

question 14
which human trait is an example of polygenic inheritance?

a height

b the abo blood groups

c attached ear lobes

d huntingtons disease

question 15
is this statement true or false?
according to mendel’s principles, 1/4 of the offspring made from a cross between two heterozygous plants will show
the recessive trait.
set up a punnett square using the details below to see if the statement is true or false.

• a cross between 2 plants that are both heterozygous for a trait pp.

fathers genes
mothers genes

true
false

Explanation:

Question 14

Polygenic inheritance involves multiple genes. Height is controlled by many genes (polygenic), while ABO blood groups (multiple alleles, not polygenic), attached ear lobes (monogenic), and Huntington’s disease (monogenic dominant) are not. So height is the polygenic trait.

Step1: Determine Parental Genotypes

Both parents are Pp, so they can pass P or p.

Step2: Set Up Punnett Square

	P	p
p	Pp	pp

Step3: Analyze Offspring

Genotypes: PP (1), Pp (2), pp (1). Phenotype for recessive (pp) is 1/4. So the statement is true.

Answer:

a. height

Question 15