Understanding Dominance and Recessiveness in Genetics

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Which phenomenon occurs when one gene controls several functions or has more than one effect?

Pleiotropy (correct)

Incomplete dominance

Complete dominance

Codominance

Which of the following describes a situation where phenotypes coincide with genotypes in a ratio of 1:2:1?

Multiple alleles

Incomplete dominance (correct)

Codominance

Pleiotropy

What kind of traits involve genes on the Y chromosome and are very rare?

Y-linked traits (correct)

Codominant traits

Multiple alleles traits

X-linked traits

In sex determination in humans, what is the genotype of a male individual?

XmY Signup and view all the answers

What type of dominance occurs when the heterozygous phenotype is unlike either homozygote?

Codominance Signup and view all the answers

Which phenomenon involves one gene influencing several traits but in different ways based on dominance relations?

Pleiotropy Signup and view all the answers

What is a characteristic of recessive traits?

Loss of function Signup and view all the answers

Which term describes a situation where the phenotype of the hybrid does not resemble either parent?

Incomplete dominance Signup and view all the answers

What is the genetic ratio in the F2 progeny of snapdragons with the genotype ratios 1 red (AA) - 2 pink (Aa) - 1 white (aa)?

1 red : 2 pink : 1 white Signup and view all the answers

Which dominance relationship is observed when the hybrid resembles both parents?

Codominance Signup and view all the answers

What poses a challenge to Mendelian analysis when certain traits do not follow Mendel's rules?

Presence of more than two alleles Signup and view all the answers

In the context of genetic laws, what defines the dominance relationship between two alleles?

Phenotype of the heterozygote Signup and view all the answers

What is a key aspect of pedigrees with dominant traits?

Affected children always have at least one affected parent Signup and view all the answers

Which pattern of inheritance indicates a rare recessive trait?

Horizontal pattern Signup and view all the answers

In pedigree analysis, what does a vertical pattern of inheritance indicate?

Rare dominant trait Signup and view all the answers

For autosomal dominant traits, what is the criteria for transmission?

Males and females transmit the trait with equal frequency Signup and view all the answers

What does the presence of unaffected children in a pedigree with dominant traits indicate?

Both parents are heterozygous Signup and view all the answers

Which condition is sometimes observed in autosomal dominant traits that is very rare and can be lethal?

Homozygous dominant (AA) Signup and view all the answers