Question

question 18
according to mendel, if an individual is heterozygous for a specific gene, the phenotype will be that of
a the recessive trait alone.
b the dominant trait alone.
c a blend of the dominant and recessive traits.
d a wild type trait.
1 point
question 19
an organism has the following genotype: aabbddeeff. how many different gametes could this organism produce?
a 2
b 4
c 8
d 16
e 32
1 point
question 20
a trait that is exhibited in a varying range of degrees, such as height in humans, is an indication that the trait is due to
a the contribution of several genes.

Explanation:

Question 18

According to Mendel's law of dominance, when an individual is heterozygous (has two different alleles, e.g., Aa) for a gene, the dominant allele masks the expression of the recessive allele. So the phenotype (observable trait) will be that of the dominant trait.

Step1: Determine heterozygous gene pairs

The formula to calculate the number of different gametes is \(2^{n}\), where \(n\) is the number of heterozygous gene pairs. In the genotype AaBBDDEEFF, only the A - a pair is heterozygous (\(n = 1\)).

Step2: Calculate the number of gametes

Using the formula \(2^{n}\), with \(n=1\), we get \(2^{1}=2\).

A trait that shows a continuous range of variation (like human height) is typically a polygenic trait. Polygenic traits are influenced by multiple genes. Each gene makes a small contribution to the overall phenotype, resulting in a range of values rather than discrete categories.

Answer:

B. the dominant trait alone.

Question 19