Podcast
Questions and Answers
The blending of dominant and recessive traits in the heterozygous state is known as ______.
The blending of dominant and recessive traits in the heterozygous state is known as ______.
incomplete dominance
When a single trait is controlled by more than two alleles, it is referred to as ______.
When a single trait is controlled by more than two alleles, it is referred to as ______.
multiple alleles
[Blank] is when one characteristic is controlled by two or more genes.
[Blank] is when one characteristic is controlled by two or more genes.
polygenic inheritance
If an original DNA strand has the sequence A-T-C-G, the new complementary strand created during replication will be ______.
If an original DNA strand has the sequence A-T-C-G, the new complementary strand created during replication will be ______.
Offspring can express a trait not seen in either parent if both parents are heterozygous carriers of a ______ allele for that trait.
Offspring can express a trait not seen in either parent if both parents are heterozygous carriers of a ______ allele for that trait.
Flashcards
Incomplete Dominance
Incomplete Dominance
When dominant and recessive traits blend in heterozygotes.
Multiple Alleles
Multiple Alleles
A trait controlled by more than two alleles.
Polygenic Inheritance
Polygenic Inheritance
A trait controlled by multiple genes, leading to a wide variety of phenotypes.
Heterozygous
Heterozygous
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Homozygous
Homozygous
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Study Notes
- Incomplete Dominance: Dominant and recessive traits combine in the heterozygous state, resulting in a blending of the traits
- Multiple Alleles: There are more than two alleles for a specific trait
- Polygenic Inheritance: A trait is controlled by more than one gene, and a variety of phenotypes are seen
- Human Genome Project exists
- Aa, Ff, li, and Jj are heterozygous (He) genotypes
- BB, cc, DD, ee, GG, and hh are homozygous (Ho) genotypes
Phenotypes Based on Genotypes
- TT and Tt are dominant phenotypes for tongue rolling
- tt is the recessive phenotype
Horn Phenotypes and Genotypes
- Straight horns is dominant to curled horns
- SS is straight
- ss is curly
Jolly Green Giant Bean Feet
- The Jolly Green Giant is heterozygous (Gg) for green bean feet and his wife is recessive (gg) for yellow bean feet
- Offspring genotypes are Gg and gg
- The offspring phenotypes are yellow bean feet and green bean feet
- Percentage of offspring with green feet is 50%
- Percentage of offspring with yellow feet is 50%
- The ratio of green to yellow is 50:50 or 0.5
- Offspring hybrids are 50%
- Purebred offspring makeup 50%
Offspring Traits
- For offspring to show a trait neither parent shows, both parents must be heterozygous for the trait
- This gives the offspring a 25% chance of having a different trait than their parents (recessive trait)
DNA Strand
- An original strand of DNA is below: G T C A G T
- The new matching strand of DNA would be: C A A T C A GT
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Description
Exploration of incomplete dominance, multiple alleles, and polygenic inheritance. Genotypes and phenotypes, including heterozygous and homozygous examples, are examined. Includes a case study on Jolly Green Giant bean feet.
