The beautiful red postman butterfly (Heliconius erato), shown below, has 21 pairs of homologous chromosomes (2N=42). If a red postman is heterozygous for just 4 genes on every chromosome, how many unique genotypes are possible in its gametes?

The beautiful red postman butterfly (Heliconius erato), shown below, has 21 pairs of homologous chromosomes (2N=42). If a red postman is heterozygous for just 4 genes on every chromosome, how many unique genotypes are possible in its gametes?

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter20: Chromosomes And Human Genetics

Section: Chapter Questions

Problem 2CT: Human sex chromosomes are XX for females and XY for males. a. With respect to an X-linked gene, how...

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Concept explainers

Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.

Question

The beautiful red postman butterfly (Heliconius erato), shown below, has 21 pairs of homologous chromosomes (2N=42). If a red postman is heterozygous for just 4 genes on every chromosome, how many unique genotypes are possible in its gametes?

a.2

b.4

c.2²¹

d.2⁴²

e. 2⁸⁴

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