Question

Is genGenetics True/False questions:

1. Height in all organisms is always a continuous trait.

2. Most continuously varying characteristics are both polygenic and influenced by environmental factors.

3. As the number of loci affecting a character increases, the number of phenotypic classes in the F2 decreases.

4. Standard deviation is calculated in the same units as the original measurements, while variance is calculated in units squared.

5. Heritability is used to estimate what proportion of variation in a trait is genetic.

6.the components of phenotypic variance include only genetic variance and environmental variance.

7. When narrow sense heritability is high for a particular trait, offspring tend to resemble their parents for that trait.

8. Heritability indicates the degree to which a characteristic Is genetically determined.

9. The heritability of an individual cannot be estimated.

10. When heritability is high, environmental factor will not influence a character.

Answer 1

Que 1.

Ans:

Height in all organisms is always a continous trait: False.

Explanation:

- Continous traits are common in humans.

- Human height is controlled by many genes.

- There is a wide variation in the height of people.

- Human height is a function of genetics and environment.

- Hence, height in all organisms is always a continous trait is false.

Que 2

Ans:

Most continuously varying characteristics are both polygenic and influenced by environmental factors: True.

Explanation:

- Continuous traits are caused by more than one gene.

- Gene expression is complex and continuous traits can also be influenced by environmental factors.

- Multiple genes and therefore, multiple alleles, affect continuous traits.

- Hence, most continuously varying characteristics are both polygenic and influenced by environmental factors.