How many chromosomes do grizzly bear egg cells have?
74 chromosomes
How many diploid cells do black bears have?
| Organism | Number of chromosomes in a cell at the end of mitosis | Number of chromosomes in a gamete |
|---|---|---|
| cabbage | 18 | 9 |
| black bear | 76 | 38 |
| human | 46 | 23 |
| peanut | 40 | 20 |
How many chromosomes does a bear have?
74 Chromosomes
How many chromosomes are found in the somatic cells of a male black bear?
Explain your answer. Sex cells only contain half the number of chromosomes found in the body cells. If the body cell of an American black bear contains 74 chromosomes, then each sex cell contains 37 chromosomes.
How many somatic cells do humans have?
There are approximately 220 types of somatic cell in the human body. Theoretically, these cells are not germ cells (the source of gametes); they transmit their mutations, to their cellular descendants (if they have any), but not to the organism’s descendants.
How many chromosomes do females have?
Females have two X chromosomes, while males have one X and one Y chromosome. A picture of all 46 chromosomes in their pairs is called a karyotype. A normal female karyotype is written 46, XX, and a normal male karyotype is written 46, XY.
How many sexes do humans have?
Based on the sole criterion of production of reproductive cells, there are two and only two sexes: the female sex, capable of producing large gametes (ovules), and the male sex, which produces small gametes (spermatozoa).
Can a female have XY chromosome?
Most males have XY chromosomes and most women have XX chromosomes. But there are girls and women who have XY chromosomes. This can happen, for example, when a girl has androgen insensitivity syndrome.
Why is there no YY chromosome?
What Causes YY Chromosomes to Occur? Known as nondisjunction, this is an error in the sperm cell’s division. The resulting child will have an extra Y chromosome in every cell of his body. However, it’s not a hereditary trait — fathers with XYY chromosomes don’t pass on this syndrome to their sons.
What is XXY gender?
Klinefelter syndrome (sometimes called Klinefelter’s, KS or XXY) is where boys and men are born with an extra X chromosome. Chromosomes are packages of genes found in every cell in the body. There are 2 types of chromosome, called the sex chromosomes, that determine the genetic sex of a baby.
Can females have XXY syndrome?
Klinefelter syndrome affects males only; females cannot have it. Klinefelter syndrome results from a genetic abnormality in which males have an extra copy of the X chromosome.
What does XY mean in pregnancy?
Biological sex in healthy humans is determined by the presence of the sex chromosomes in the genetic code: two X chromosomes (XX) makes a girl, whereas an X and a Y chromosome (XY) makes a boy. In this way, it is the presence or absence of the Y chromosome in a healthy human that differentiates boy from girl.
Why do I only have girl babies?
Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome. An X chromosome combines with the mother’s X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mother’s to make a boy (XY).
What are you if you are XX?
If you are male, you have an XY pair. If you are female, you have an XX pair. The other 22 pairs are called autosomes, and are the same in males and females.
How do I know if I’m intersex?
The person must have both ovarian and testicular tissue. This may be in the same gonad (an ovotestis), or the person might have 1 ovary and 1 testis. The person may have XX chromosomes, XY chromosomes, or both. The external genitals may be ambiguous or may appear to be female or male.
Can a hermaphrodite have both working parts?
The true hermaphrodite has both testicular and ovarian tissues present in either the same or opposite gonads. Both the external genitalia and the internal duct structures display gradations between male and female. Among those raised as females, two-thirds will have clitoromegaly. …
Can a hermaphrodite have a baby?
Background: There are 11 reported cases of pregnancy in true hermaphrodites, but none with advanced genetic testing. All known fetuses have been male. Case: A true hermaphrodite with a spontaneous pregnancy prenatally known to have a remaining portion of a right ovotestis, delivered a male neonate.
Can hermaphrodites humans have babies with themselves?
Hermaphrodites can either reproduce by virtue of self-fertilization or they can mate with a male and use the male derived sperm to fertilize their eggs. While virtually the entire progeny that is produced by self-fertilization is hermaphroditic, half of the cross-progeny is male.