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Lethal Alleles

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Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...

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Related Experiment Video

Updated: Jan 4, 2026

Recessive Lethal Alleles Cause Genetic Disorders in Humans

Recessive Lethal Alleles Cause Genetic Disorders in Humans

Linguistic ability and early language exposure.

Rachel I Mayberry¹, Elizabeth Lock, Hena Kazmi

¹School of Communication Sciences and Disorders, McGill University, 1266 Pine Avenue West, Montreal, Quebec H3G 1A8, Canada. rachel.mayberry@mcgill.ca

|May 3, 2002

Summary

This summary is machine-generated.

Early language exposure, not its form, is key for later language learning. Infants exposed to any language early on, deaf or hearing, learn new languages well, unlike those with delayed exposure.

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Recessive Lethal Alleles Cause Genetic Disorders in Humans

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Mouse Models of Cancer and Pre-clinical Testing of Cancer Drugs

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Area of Science:

Linguistics
Developmental Psychology
Neuroscience

Background:

The critical period hypothesis suggests age significantly impacts language acquisition.
Previous research has not clarified if the onset and type of early language experience influence later language learning abilities.

Purpose of the Study:

To investigate the impact of early language exposure onset and modality on subsequent language learning.
To determine if the form of early language (signed vs. spoken) affects later language acquisition.

Main Methods:

Compared language learning outcomes in deaf and hearing individuals with varying early language exposure.
Assessed proficiency in learning a new language (signed or spoken) later in life.

Main Results:

Individuals exposed to language in infancy (deaf and hearing) showed comparable success in learning a new language.
Deaf individuals with minimal early language exposure performed poorly in later language learning, irrespective of early or later language modality.

Conclusions:

The onset of language experience during early brain development is critical for language-learning ability.
Language learning capacity is independent of the specific modality (signed or spoken) of early language exposure.