Genetics Answers

1) Albinism is manifested in humans who inherited the recessive trait. What are the genotypes of the parents and offspring from the following families? Kindly please show your solution.

a. A non-albino father and an albino mother have 4 non-albino children.

• father's genotype:
• mother's genotype:
• offspring's genotype:

b. Both non-albino parents have 5 children, 4 albino, and 1 non- albino.

• father's genotype:
• mother's genotype:
• offspring's genotype:

c. An albino father and a non-albino mother have 7 children, 3 albino, and 4 non-albino

• father's genotype:
• mother's genotype:
• offspring's genotype:

Roger is legally blind. His vision impairment is a complication of diabetes mellitus. Can you describe what structural changes in Roger’s eyes have caused his blindness? As you were helping him cross the street, a fellow pedestrian suddenly stumbled into your path. Without any signal from you, Roger jumped back to avoid hitting the other person. If Roger is blind, how could he have reacted this way?

Hi,

could you please help me answer this question on genetic.

In a different species of plant, bell shaped flower is dominant to tube shaped flower and the gene controlling this trait is inherited in normal Mendelian fashion. Flower colour can be either red, white, or in combination pink. The two genes are not linked.

Give a reasoned explanation for the simultaneous transmission of characteristics, the possible outcomes of crossing a heterozygous bell flowered plant with pink flowers, and a tube flowered plant with white flowers. You should also clearly identify the phenotypic combinations that are not possible from this cross. 

Many thanks in advance!  

in order for a reccesive trait to show the genotype must be

In tomatoes, red fruit is dominant to yellow fruit and hairy stems are dominant to hairless (smooth) stems. The two genes controlling these traits are inherited in normal Mendelian fashion and are not linked.

a)   Produce a suitable key for this information in terms of the individual alleles of the genes given.                                                                                 

b)   What are the possible genotypes of plants showing the following forms:    

i)              Red fruit and smooth stems

ii)             Yellow fruit and hairy stems

iii)           Red fruit and hairy stems 

In a different species of plant, the bell-shaped flower is dominant to tube-shaped flower and the gene controlling this trait is inherited in normal Mendelian fashion. Flower colour can be either red, white, or in combination pink. The two genes are not linked.

Give a reasoned explanation along with the use of full genetic diagrams to proof your answer, to explain in terms of the simultaneous transmission of characteristics, the possible outcomes of crossing a heterozygous bell flowered plant with pink flowers, and a tube flowered plant with white flowers. You should also clearly identify the phenotypic combinations that are not possible from this cross.

explain it clearly, please.          

Does crossing two plants, each heterozygous for two traits, always produce a phenotypic ratio of 9:3:3:1 in the offspring? A) Yes, unless there are linked genmes, incomplete dominance, or, in animals, sex chromosomes involved. B)Yes, regardless of the situation. C) No, because the results of each cross are completely random D) None of these is correct

Which of the following answers contributes to genetic diversity within a species

mutation occurs in DNA sequence, when individual undergoes asexual reproduction, when sexual reproduction occurs between 2 individuals

The presence of freckles (F) is dominant to no freckles (f). Jake and his mom have freckles, but his sister and Dad do not have freckles. Complete the Punnett square that shows Jake's family.

The fur colour of Labrador dogs is determined by three alleles: black (FB), chocolate (FC) and yellow (FY). If black is dominant to yellow, and chocolate is dominant to yellow, what will the puppy colours be is a heterozygous chocolate Labrador and a yellow Labrador are bred?

Heterozygous chocolate parent genotype:

Yellow lab parent genotype:

Offspring phenotypes and ratios: