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Genetics 2. Red orchids with straight petals are crossed with white orchids with curly petals. The results are pink orchids with wavy petals. a. What are the genotypes of the two parent orchid plants? Remember: You are dealing with two different traits. First parent: (color) (shape) Second parent: b. What is the genotype of the offspring orchids? Offspring:

Genetics 2. Red orchids with straight petals are crossed with white orchids with curly petals. The results are pink orchids with wavy petals. a. What are the genotypes of the two parent orchid plants? Remember: You are dealing with two different traits. First parent: (color) (shape) Second parent: b. What is the genotype of the offspring orchids? Offspring:

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Exercise: Understanding Inheritance and Sex Determination** --- ### Genetics: Inheritance of Orchid Traits 2. **Genetic Crossing of Orchids** Red orchids with straight petals are crossed with white orchids that have curly petals. The resulting offspring are pink orchids with wavy petals. a. **Determine the Genotypes of Parent Orchids:** *Note: You are dealing with two different traits.* - **First Parent:** - Color: ____ - Shape: ____ - **Second Parent:** - Color: ____ - Shape: ____ b. **Determine the Genotype of Offspring Orchids:** - Offspring: - ____ - ____ --- ### Exercise #5: Sex-Linked Traits #### Sex Determination Humans have 23 homologous pairs of chromosomes. Twenty-two of these pairs are numbered 1 through 22. The 23rd pair is labeled with the letters “X” and “Y” for males, and “X” and “X” for females. These labels distinguish them as the sex chromosomes. During meiosis, two types of sperm are produced: those carrying the X chromosome and those carrying the Y chromosome. Females produce eggs carrying only the X chromosome. - If the Y chromosome is present in an embryo, the child becomes male. - If the Y is not present, the child becomes female. The presence or absence of the Y chromosome determines the child’s sex. A male child receives a Y chromosome from his father and an X chromosome from his mother. A female child receives an X chromosome from each parent. --- **Question:** Draw a Punnett Square to illustrate a cross of X and Y chromosomes in the fertilization of male and female gametes. The offspring boxes should reveal why there is about a 50% male to 50% female ratio in the human population. *A blank Punnett Square is provided for this exercise.*
Transcribed Image Text:**Exercise: Understanding Inheritance and Sex Determination** --- ### Genetics: Inheritance of Orchid Traits 2. **Genetic Crossing of Orchids** Red orchids with straight petals are crossed with white orchids that have curly petals. The resulting offspring are pink orchids with wavy petals. a. **Determine the Genotypes of Parent Orchids:** *Note: You are dealing with two different traits.* - **First Parent:** - Color: ____ - Shape: ____ - **Second Parent:** - Color: ____ - Shape: ____ b. **Determine the Genotype of Offspring Orchids:** - Offspring: - ____ - ____ --- ### Exercise #5: Sex-Linked Traits #### Sex Determination Humans have 23 homologous pairs of chromosomes. Twenty-two of these pairs are numbered 1 through 22. The 23rd pair is labeled with the letters “X” and “Y” for males, and “X” and “X” for females. These labels distinguish them as the sex chromosomes. During meiosis, two types of sperm are produced: those carrying the X chromosome and those carrying the Y chromosome. Females produce eggs carrying only the X chromosome. - If the Y chromosome is present in an embryo, the child becomes male. - If the Y is not present, the child becomes female. The presence or absence of the Y chromosome determines the child’s sex. A male child receives a Y chromosome from his father and an X chromosome from his mother. A female child receives an X chromosome from each parent. --- **Question:** Draw a Punnett Square to illustrate a cross of X and Y chromosomes in the fertilization of male and female gametes. The offspring boxes should reveal why there is about a 50% male to 50% female ratio in the human population. *A blank Punnett Square is provided for this exercise.*
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