Sexual reproduction involves ________.

Which of the following is a genetically inherited human characteristic that is not affected by any changes in environmental conditions?
I. Skin color
II. Blood group
III. Presence of a dimple
IV. Height

• Traits under discontinuous variation have limited range 
• Traits under continuous variation have unlimited range 
• Discontinuous variation is due to the influence of genes alone
• Continuous variation is due to the combined effects of genes and environment

What is this definition: 'Differences between organisms caused by environmental factors.'

• Variation is the difference between individuals of same population
• Variation can be caused due to genes or due to environmental factors

What is this definition: 'A group of organisms that can reproduce with each other to produce offspring that will also be able to reproduce'?

• Carl Linnaeus is the father of modern taxonomy
• Binomial nomenclature is used to describe the name of the species
• Binomial nomenclature has 2 parts: genus and species (in italics)
• Species is the last and principal part of the taxonomical hierarchy
• Species are group of organisms with similar traits capable of interbreeding and producing future generations

What is this definition: 'Differences between organisms caused by differences in the DNA they inherit from their parents'?

• Even identical twins have difference in genetic makeup. This is due to genetic variation.
• Variation causes difference in traits such as height, eye color, skin color and many more
• Variation can be continuous or discontinuous
• Variation is due to genes or due to combined influence of genes and environment

What can cause variation?

• No two individuals of same population is identical. This is due to variation.
• Variation causes difference in phenotypes such as height, weight, blood group and many more
• Variation can be continuous or discontinuous
• Variation is due to genes or due to combined influence of genes and environment

What does variation mean?

• No two individuals of same population is identical. This is due to variation.
• Variation causes difference in traits such as height, eye color, skin color and many more
• Variation can be continuous or discontinuous
• Variation is due to genes or due to combined influence of genes and environment

Which of the following would increase the number of different alleles in a population?

Variation in a trait may be due to the change in genetic material. What do you call this type of change?

• DNA is the genetic material for all organisms
• DNA is made of sequence of nucleic acids
• Gene is the unit of heredity and codes for particular trait
• Change in sequence of nucleic acid is called mutation
• Not all mutations are harmful

The following information is about two individuals, X and Y.
*Individual X: presence of a dimple
*Individual Y: no dimple
Which of the following factors causes the difference in the trait between the two individuals?

• Traits under discontinuous variation have limited range 
• Traits under continuous variation have unlimited range 
• Discontinuous variation is due to the influence of genes alone
• Continuous variation is due to the combined effects of genes and environment

Which of the following statements is true?

• Variation is the difference in genetic makeup of two individuals of the same population
• Variation can be continuous or discontinuous
• Continuous variation is influenced by genetic and environmental factors
• Discontinuous variation is influenced by genetic factors
• Inheritance of genes from parents can be studied using pedigree chart

You get __% of your DNA from each parent.

• Gametes are haploid
• Zygote is diploid
• 50% DNA is from each parent

Emily has brown hair.
Which Statement most likely explains why Emily has brown hair?

• Gene is the unit of heredity
• Expression of gene is observed as traits like hair color, blood group, etc

Which of the following is an example of Inherited variation?

• Traits under discontinuous variation have limited range 
• Traits under continuous variation have unlimited range 
• Discontinuous variation is due to the influence of genes alone
• Continuous variation is due to the combined effects of genes and environment

Differences in DNA between individuals or populations

• Gene is a segment of DNA that codes for particular trait
• Gene is the unit of heredity
• Variation refers to difference existing between individuals of same population
• Variation can be due to effect of genes or environment or both