ABO blood group is co-dominant for AB and O is recessive. Rh (+/-) factor is completely dominant. A man with O/positive blood and a woman with A/negative blood have six children. All of their children have A + blood type. What can you conclude about the parents’ genotypes? Group of answer choices Both mother and father are likely homozygous  at both loci Mother was homozygous at the ABO locus but heterozygous at the Rh factor locus Father was homozygous at the ABO locus but heterozygous at the Rh factor locus Mother was heterozygous at both loci

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN:9781305967359
Author:STARR
Publisher:STARR
Chapter13: Patterns In Inherited Traits
Section: Chapter Questions
Problem 6GP: In sweet pea plant, an allele for purple flowers (P) is dominant when paired with a recessive allele...
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ABO blood group is co-dominant for AB and O is recessive. Rh (+/-) factor is completely dominant. A man with O/positive blood and a woman with A/negative blood have six children. All of their children have A + blood type. What can you conclude about the parents’ genotypes?

Group of answer choices
Both mother and father are likely homozygous  at both loci
Mother was homozygous at the ABO locus but heterozygous at the Rh factor locus
Father was homozygous at the ABO locus but heterozygous at the Rh factor locus
Mother was heterozygous at both loci
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