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BIOL Lab2

By Mo7a_07 Feb 14, 2015 326 Words
Name: Mohammed Alghamdi
BIOL lab II

1-A cross gives a 3:1 phenotypic ratio. What are the genotypes of the parents? 3:1. (heterozygous parents)

2- According to Mendel’s law of segregation, parents who both have the genotype Aa would produce what gametes?

A germ cell Aa undergoes meiosis

3-What is the genotype of a plant that produces green peas? Yellow peas are dominant.

Yy or yy when crossed with a heterozygote (Yy) will give some offspring that are green

4- To determine whether an animal with the dominant phenotype is heterozygous or homozygous, it is best to cross it with the SAME phenotype.

5- If you performed the Drosophila cross LL × ll, what phenotypic ratio would you expect among the offspring?

3:1

6- According to Mendel’s law of independent assortment, how many different types of gametes would an AaBb parent have? An AABb parent?

AaBb: AB, Ab, aB, ab (4)
AABb: AB, Ab (2)

7- What is the genotype of a homozygous long-winged fly that is heterozygous for gray body color?

LLGg

8-What is the expected phenotypic ratio among offspring if both parents are heterozygous for both traits? 9 short, black | 3 short, red | 3 long, black | 1 long, red (9:3:3:1)

9- Why do you expect class data to be closer to the expected ratio than your individual data? It averages out.
10- What is the genotype of a white-eyed male fruit fly?
white eyed, male X r Y. white eyed, female X r X r

11- Which gender can have white eyes if the female parent is homozygous dominant for red eyes and the male parent has white eyes?

Male offspring have white eyes

12- What does a father always give his male offspring in X-linked genetic crosses? X-linked genes are never passed from father to son.

13- What is the phenotype of a tobacco plant with the genotype Cc? Phonotype of C

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