DEVIATIONS FROM MENDELISM

Question 1

In a cross between true-breeding red and white flowers, the F1 progeny obtained was pink. In what flowers do we see this phenomenon?

Answer 1

snapdragon/dog flower/ANTIRRHINUM
Mirabilis jalpa

Question 2

The phenotypic and genotypic ratio obtained when the F1 generation was crossed in incomplete dominance

Answer 2

genotype: 1:2:1
phenotype: 1:2:1

Question 3

INCOMPLETE DOMINANCE

Answer 3

Incomplete dominance is a form of Gene interaction in which both alleles of a gene at a locus are partially expressed, often resulting in an intermediate or different phenotype

Question 4

CODOMINANCE

Answer 4

Codominance is a form of inheritance wherein the alleles of a gene pair in a heterozygote are fully expressed. As a result, the phenotype of the offspring is a combination of the phenotype of the parents.

Question 5

an example for codominance is

Answer 5

1. ab-blood type in humans
2. sickle cell Anaemia

Question 6

many alleles coding for one trait

Answer 6

multiple allelism

Question 7

define pleiotropy

Answer 7

A condition in which a single gene influences more than one trait.
EX: starch synthesis in pea plant

Question 8

PKU is an inborn autosomal recessive metabolic disorder in which the individual lacks phenylalanine hydroxylase that converts phenylalanine to tyrosine

Answer 8

PLEIOTROPY

Question 9

polygenic inheritance

Answer 9

the phenomenon in which a single trait is controlled by many genes

Question 10

skin color in human beings

Answer 10

polygenic inheritance