4 Questions
What is the inheritance pattern of the creeper allele in chickens?
Dominant lethal allele
What is the effect of the lethal allele on homozygous creeper chickens?
They do not survive
What is the expected offspring ratio from crossing two creeper chickens according to Mendelian genetics?
3/4 creeper, 1/4 normal
Which term describes alleles that cause death when present in homozygous form?
Lethal alleles
Study Notes
Inheritance Pattern of Creeper Allele
- The creeper allele follows an autosomal recessive inheritance pattern in chickens.
Effect of Lethal Allele on Homozygous Creeper Chickens
- The lethal allele causes death in homozygous creeper chickens (cc).
- Homozygous creeper chickens, having two copies of the creeper allele (cc), do not survive.
Offspring Ratio from Crossing Creeper Chickens
- Crossing two creeper chickens (Cc) produces an offspring ratio of 2:1 (heterozygous:homozygous) according to Mendelian genetics.
- The expected offspring genotypes are 2 Cc (heterozygous) and 1 cc (homozygous).
Lethal Alleles
- Alleles that cause death when present in homozygous form are called lethal alleles.
- The creeper allele is an example of a lethal allele.
Test your knowledge on the inheritance pattern of lethal alleles, where some genes are lethal when both alleles are present. Explore examples such as Huntington's disease in humans and the 'creeper' allele in chickens, which causes short and stunted legs.
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