When Two Heterozygotes Are Mated, the Ratios of the Offspring

question 9

Multiple Choice

When two heterozygotes are mated, the ratios of the offspring produced should be in a 1:2:1 ratio if normal Mendelian segregation is occurring. If one of the alleles is dominant, then the phenotypes observed should be present in a 3:1 ratio with the dominant phenotype more common than the recessive one. We can use an χ² goodness-of-fit test to test whether the ratio of offspring is indeed 3:1. Imagine a cross is performed and the number of offspring observed are 65 with the dominant phenotype and 35 with the recessive phenotype. What is the χ² value we would obtain?

• A) 2.267
• B) 3.000
• C) 4.396
• D) 5.333

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Definitions:

Body Position

The posture or arrangement of the body and its limbs, which can influence various physiological and psychological processes.

Movements

Any physical activity or change in position or posture, generated by the body's musculoskeletal system.

Pressure

The force exerted per unit area on an object's surface by a fluid or gas, or the stress within solids.

Kinesthetic Receptors

Specialized sensory receptors located in muscles, tendons, and joints involved in sensing the position and movement of parts of the body.