In Garden Peas,one Pair of Alleles Controls the Height of the Plant,and

question 89

Multiple Choice

In garden peas,one pair of alleles controls the height of the plant,and a second pair of alleles controls flower color.The allele for tall (D) is dominant to the allele for dwarf (d) ,and the allele for purple (P) is dominant to the allele for white (p) .A tall plant with purple flowers crossed with a dwarf plant with white flowers produces 1/4 tall purple,1/4 tall white,1/4 dwarf purple,and 1/4 dwarf white.What is the genotype of the parents?  

• A) Dd Pp x dd pp
• B) Dd Pp x Dd Pp
• C) DD Pp x dd Pp
• D) Dd pp x dd Pp
• E) DD Pp x dd pp

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Definitions:

Chromosomal Abnormalities

Genetic defects involving changes in the number or structure of chromosomes, leading to various developmental and health problems.

Down Syndrome

A genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is characterized by intellectual disability and physical features such as a distinct facial appearance.

Mosaicism

A cause of Down syndrome in which cell division occurs unevenly, so that some cells have 45 chromosomes and some have 47. People with mosaic Down syndrome may have fewer physical characteristics, better speech, and higher intellectual functioning, depending upon the numbers of cells affected.

Dual Diagnosis

The co-occurrence of serious behavioural or psychiatric disorders in people with developmental disabilities.